Podcasting, previously known as "audioblogging", has its roots dating back to the 1980s. With the advent of broadband internet and portable digital audio playback devices such as the iPod, podcasting began to catch hold in late 2004. Today there are more than 115,000 English-language podcasts available on the internet, and dozens of websites available for distribution at little or no cost to the producer or listener. According to one survey in 2017, 42 million Americans above the age of twelve listen to podcasts at least on a weekly basis.
Before the advent of the World Wide Web, in the 1980s, RCS (Radio Computing Services), provided music and talk-related software to radio stations in a digital format. Before online music digital distribution, the MIDI format as well as the Mbone, Multicast Network was used to distribute audio and video files. The MBone was a multicast network over the Internet used primarily by educational and research institutes, but there were audio talk programs.
Many other jukeboxes and websites in the mid-1990s provided a system for sorting and selecting music or audio files, talk, segue announcements of different digital formats. There were a few websites that provided audio subscription services. In 1993, the early days of Internet radio, Carl Malamud launched Internet Talk Radio which was the "first computer-radio talk show, each week interviewing a computer expert." It was distributed "as audio files that computer users fetch one by one." A 1993 episode of The Computer Chronicles described the concept as "asynchronous radio." Malamud said listeners could pause and restart the audio files at will, as well as skip content they did not like.
The development of downloaded music did not reach a critical mass until the launch of Napster, another system of aggregating music, but without the subscription services provided by podcasting or video blogging aggregation client or system software. Independent of the development of podcasting via RSS, a portable player and music download system had been developed at Compaq Research as early as 1999 or 2000. Called PocketDJ, it would have been launched as a service for the Personal Jukebox or a successor, the first hard-disk based MP3-player.
In 2001, Applian Technologies of San Francisco, California introduced Replay Radio (later renamed into Replay AV), a TiVo-like recorder for Internet Radio Shows. Besides scheduling and recording audio, one of the features was a Direct Download link, which would scan a radio publishers site for new files and copy them directly to a PC's hard disk. The first radio show to publish in this format was WebTalkGuys World Radio Show, produced by Rob and Dana Greenlee.
In September 2000, the first system that enabled the selection, automatic downloading and storage of serial episodic audio content on PCs and portable devices was launched  from early MP3 player manufacturer, i2Go. To supply content for its portable MP3 players, i2Go introduced a digital audio news and entertainment service called MyAudio2Go.com that enabled users to download episodic news, sports, entertainment, weather, and music in audio format for listening on a PC, the eGo portable audio player, or other MP3 players. The i2GoMediaManager and the eGo file transfer application could be programmed to automatically download the latest episodic content available from user selected content types to a PC or portable device as desired. The service lasted over a year, but succumbed when the i2Go company ran out of capital during the dot-com crash and folded.
In October 2000, the concept of using enclosures in RSS feeds was proposed in a draft by Tristan Louis, The idea was implemented (in a somewhat different form) by Dave Winer, a software developer and an author of the RSS format. Winer had received other customer requests for "audioblogging" features and had discussed the enclosure concept (also in October 2000), with Adam Curry, a user of Userland's Manila and Radio blogging and RSS aggregator software.
Winer included the new functionality in RSS 0.92 by defining a new element called "enclosure", which would simply pass the address to a media aggregator. On January 11, 2001, Winer demonstrated the RSS enclosure feature by enclosing a Grateful Dead song in his Scripting News weblog.
For its first two years, the enclosure element had relatively few users and many developers simply avoided using it. Winer's company incorporated both RSS-enclosure and feed-aggregator features in its weblogging product, Radio Userland, the program favored by Curry, audioblogger Harold Gilchrist and others. Since Radio Userland had a built-in aggregator, it provided both the "send" and "receive" components of what was then called "audioblogging". All that was needed for "podcasting" was a way to automatically move audio files from Radio Userland's download folder to an audio player (either software or hardware) -- along with enough compelling audio to make such automation worth the trouble.
In June 2003, Stephen Downes demonstrated aggregation and syndication of audio files in his Ed Radio application. Ed Radio scanned RSS feeds for MP3 files, collected them into a single feed, and made the result available as SMIL or Webjay audio feeds.
In September 2003, Winer created a special RSS-with-enclosures feed for his Harvard Berkman Center colleague Christopher Lydon's weblog, which previously had a text-only RSS feed. Lydon, a former New York Times reporter, Boston TV news anchor and NPR talkshow host, had developed a portable recording studio, conducted in-depth interviews with bloggers, futurists and political figures, and posted MP3 files as part of his Harvard blog. When Lydon had accumulated about 25 audio interviews, Winer gradually released them as a new RSS feed. Announcing the feed in his weblog, Winer challenged other aggregator developers to support this new form of content and provide enclosure support.
Not long after, Pete Prodoehl released a skin for the Amphetadesk aggregator that displayed enclosure links. Doug Kaye, who had been publishing MP3 recordings of his interviews at IT Conversations since June, created an RSS feed with enclosures. 'IT Conversations.' Lydon's blog eventually became Radio Open Source and is now the oldest, still-running podcast.
October 2003, Winer and friends organized the first BloggerCon weblogger conference at Berkman Center. CDs of Lydon's interviews were distributed as an example of the high-quality MP3 content enclosures could deliver; Bob Doyle demonstrated the portable studio he helped Lydon develop; Harold Gilchrist presented a history of audioblogging, including Curry's early role, and Kevin Marks demonstrated a script to download RSS enclosures and pass them to iTunes for transfer to an iPod. Curry and Marks discussed collaborating.
After the conference, Curry offered his blog readers an RSS-to-iPod script (iPodder) that moved MP3 files from Userland Radio to iTunes, and encouraged other developers to build on the idea.
In November 2003, the company AudioFeast (later renamed PodBridge, then VoloMedia) filed a patent application for “Method for Providing Episodic Media” with the USPTO based on its work in developing the AudioFeast service launched in September 2004. Although AudioFeast did not refer to itself as a podcasting service and was not built on RSS, it provided a way of downloading episodic audio content through desktop software and portable devices, with a system similar to the MyAudio2Go.com service four years before it. (AudioFeast shut down its service in July 2005 due to the unwillingness of its free customers to pay for its $49.95 paid annual subscription service, and a lack of a strong competitive differentiation in the market with the emergence of free RSS podcatchers.)
In September 2004, the media-in-newsfeed idea was picked up by multiple developer groups. While many of the early efforts remained command-line based, the very first podcasting client with a graphic user interface was iPodderX (later called Transistr after a trademark dispute with Apple), developed by August Trometer and Ray Slakinski. It was released first for the Mac, then for the PC. Shortly thereafter, another group (iSpider) rebranded their software as iPodder and released it under that name as Free Software (under GPL). The project was terminated after a cease and desist letter from Apple (over iPodder trademark issues). It was reincarnated as Juice and CastPodder.
Writing for The Guardian in February 2004, journalist Ben Hammersley suggested the term "podcasting" as a name for the nascent technology. Seven months later, Dannie Gregoire used the term "podcasting" to describe the automatic download and synchronization of audio content; he also registered several 'podcast' related domains (e.g. podcast.net).
The use of 'podcast' by Gregoire was picked up by podcasting evangelists such as Dave Slusher, Winer and Curry, and entered common usage. Also in September, Adam Curry launched a mailing list, then Slashdot had a 100+ message discussion, bringing even more attention to the podcasting developer projects in progress.
On September 28, 2004, Blogger and technology columnist Doc Searls began keeping track of how many "hits" Google found for the word "podcasts". His first query reportedly returned 24 results. On September 28, 2004, there were 526 hits on Google's search engine for the word "podcasts". Google Trends marks the beginning of searches for 'podcast' at the end of September. On October 1, 2004, there were 2,750 hits on Google's search engine for the word "podcasts". This number continued to double every few days.
By October 11, 2004, capturing the early distribution and variety of podcasts was more difficult than counting Google hits. However, by the end of October, The New York Times had reported on podcasts across the United States and in Canada, Australia and Sweden, mentioning podcast topics from technology to veganism to movie reviews.
USA Today told its readers about the "free amateur chatfests" the following February, profiling several podcasters, giving instructions for sending and receiving podcasts, and including a "Top Ten" list from one of the many podcast directories that had sprung up. Those Top Ten programs gave further indication of podcast topics: four were about technology (including Curry's Daily Source Code, which also included music and personal chat), three were about music, one about movies, one about politics, and—at the time number 1 on the list—The Dawn and Drew Show, described as "married-couple banter," a program format that (as USA Today noted) was popular on American broadcast radio in the 1940s (e.g. Breakfast with Dorothy and Dick). After Dawn and Drew, such "couplecasts" became quite popular among independent podcasts, the most notable being the London couple Sowerby and Luff, whose talk show The Big Squeeze quickly achieved a global audience via the podcast Comedy 365. On October 18, 2004, the number of hits on Google's search engine for the word "podcasts" surpassed 100,000. See September 28, 2005.
In October 2004, detailed how-to podcast articles had begun to appear online, and a month later, Liberated Syndication (Libsyn) launched the first Podcast Service Provider, offering storage, bandwidth, and RSS creation tools. "Podcasting" was first defined in Wikipedia. In November 2004, podcasting networks started to appear on the scene with podcasters affiliating with one another. One of the earliest adopters from the mainstream media was the BBC, with the BBC World Service show, Go Digital, podcast in August 2001. The first domestic BBC show to be podcast was In Our Time, made available as a podcast in November 2004.
In June 2005, Apple added podcasting to its iTunes 4.9 music software and building a directory of podcasts at its iTunes Music Store. The new iTunes could subscribe to, download and organize podcasts, which made a separate aggregator application unnecessary for many users. Apple also promoted creation of podcasts using its GarageBand and QuickTime Pro software and the MPEG 4 Audio (M4A) format instead of MP3.
In July 2005, U.S. President George W. Bush became a podcaster of sorts, when the White House website added an RSS 2.0 feed to the previously downloadable files of the president's weekly radio addresses. Also in July, the first People's Choice Podcast Awards were held during Podcast Expo. Awards were given in 20 categories. On September 28, 2005, exactly a year after first tracking hits for the word "podcasts" on Google's search engine, Google found more than 100,000,000 hits on the word "podcasts." In November 2005, the first Portable Media Expo and Podcasting Conference was held at the Ontario Convention Center in Ontario, California. The annual conference changed its name to the Podcast and New Media Expo which stopped being held in 2015. On December 3, 2005, "Podcast" was named the word of the year in 2005 by the New Oxford American Dictionary and would be in the dictionary in 2006.
In February 2006, following London radio station LBC's successful launch of the first premium-podcasting platform LBC Plus, there was widespread acceptance that podcasting had considerable commercial potential. UK comedian Ricky Gervais launched a new series of his popular podcast The Ricky Gervais Show. The second series of the podcast was distributed through audible.co.uk and was the first major podcast to charge consumers to download the show at 95 pence per half-hour episode. The first series of The Ricky Gervais Show podcast had been freely distributed by the Positive Internet Company and marketed through The Guardian newspaper's website, and had become the world's most successful podcast to date with over 4.5 million downloads two months after the show was released according to The Guinness Book of World Records. Even in its new subscription format, The Ricky Gervais Show was regularly the most-downloaded podcast on iTunes.
In February 2006, LA podcaster Lance Anderson became the first to take a podcast and create a live venue tour. The Lance Anderson Podcast Experiment included a sold out night in The Pilgrim, (23rd Feb 2006) a central Liverpool (UK) venue followed by a theatrical event at The Rose Theatre, Edge Hill University (24th Feb 2006) which included appearances by Mark Hunter from The Tartan Podcast, Jon and Rob from Top of the Pods, Dan Klass from The Bitterest Pill via video link from Los Angeles and live music from The Hotrod Cadets. In addition, Anderson was also invited to take part in the first ever Podcast Forum at CARET, the Centre for Applied Research in Educational Technologies at the University of Cambridge (21st Feb 2006). Anderson was joined at this event by Dr. Chris Smith from the Naked Scientists Podcast; Debbie McGowan, an Open University lecturer and advocate for podcasting in education; and Nigel Paice, a professional music producer and podcasting tutor. In March 2006, Canadian Prime Minister Stephen Harper became the first head of government to issue a podcast, the "Prime Minister of Canada's Podcast". In July 2009, the company VoloMedia is awarded the "Podcast patent" by the USPTO in patent number 7,568,213. Dave Winer, the co-inventor of podcasting (with Adam Curry), points out that his invention predated this patent by two years.
In March 2007 after being On Air talent and being fired from KYSR (STAR) in Los Angeles, Ca. Jack and Stench started their own subscription based podcast. At $5.00 per subscription, their loyal fans had access to a one-hour podcast, free of any commercials. They have had free local events at bars, ice cream parlors and restaurants all around Southern California. With a successful run of 5 years and over 1200 podcasts (as of March 2012) The Jack and Stench show is among the longest running monetized podcasts.
The Adam Carolla Show started as a regular weekday podcast in March 2009 and by March 2011, 59.6 million podcasts had been downloaded, breaking Ricky Gervais previous world record. The BBC noted in 2011 that more people (eight million in the UK or about 16% of the population, with half listening at least once a week - a similar proportion to the USA) had downloaded podcasts than used Twitter.
With a run of eight years (as of October 2013), the various podcasts provided by Wrestling Observer/Figure Four Online, including Figure Four Daily and the Bryan and Vinny Show with host Bryan Alvarez, and Wrestling Observer Radio with hosts Alvarez and Dave Meltzer, have produced over 6,000 monetized podcasts at a subscription rate of $10.99 per month. Their subscription podcast model launched in June 2005. Alvarez and Meltzer were co-hosts in the late 1990s at Eyada.com, the first Internet-exclusive live streaming radio station, broadcasting out of New York City. Their show, Wrestling Observer Live, was the most-listened-to program on the network, and the final show to air before the station closed down. Wrestling Observer Live with Alvarez and Mike Sempervive continues to air today on Sirius Satellite Radio channel 92/94/794 and XM Radio 208 in addition to over-the-air Sports Byline USA radio affiliates.
Podcasts are audio recordings of people (usually a dialogue of more than one person) and are predominantly purely audio recordings, but now there has been influx of people filming themselves recording the podcasts and sharing them on platforms such as Youtube.com. In the beginning of “audio blogging”/ radio and video, there were very clear lines separating the audio and visual world, but now with the emergence and popularity of websites like youtube, it seems as though those lines are beginning to blur.
Popular youtuber and social media influencer Jenna Marbles and her boyfriend Julien Solomita are an example of those who have blurred the lines of the audio and visual worlds. Their podcast videos reach an average of 300,000 to 400,000 views, and they have over 600,000 subscribers. Their podcasts date back 3 years to 2014, with topics such as current events, trivia and unpopular opinions. Although both Jenna and Julien started off their Youtube careers as content creators, making videos, using audio and video, their recent switch to audio/ video podcasting has gotten traction.
H3 Podcast, the official podcast of Ethan and Hila Klein of h3h3productions, is a similar Youtube account that hosts podcasts speaking on current events in popular culture but uploads them to Youtube in video format.
Classes of MBA students have been commissioned to research podcasting and compare possible business models, and venture capital flowing to influential content providers.
As is often the case with new technologies, pornography has become a part of the scene, producing what is sometimes called podnography.
The growing popularity of podcasting introduced a demand for music available for use on the shows without significant cost or licensing difficulty. Out of this demand, a growing number of tracks, by independent as well as signed acts, are now being designated "podsafe". (See also Podcasting and Music Royalties.)
Podcasting has been given a major push by conventional media. (See Podcasting by traditional broadcasters.)
Podcasting has presented both opportunities and challenges for mainstream radio outlets, which on one hand see it as an alternative medium for their programs while on the other hand struggle to identify its unique affordances and subtle differences. In a famous example of the way online statistics can be misused by those unused to the nuances of the online world, marketing executives from the ABC in Australia were unsure of how to make sense of why Digital Living, at that stage a little-known podcast from one of their local stations, outrated all of their expensively produced shows. It turned out that a single segment on Blu-ray had been downloaded a massive 150,000 times in one day from a single location in China.
For example, podcasting has been picked up by some print media outlets, which supply their readers with spoken versions of their content. One of the first examples of a print publication to produce an audio podcast to supplement its printed content was the international scientific journal Nature. The Nature Podcast was set up in October 2005 by Cambridge University's award-winning "Naked Scientist", Chris Smith, who produces and presents the weekly show.
Although firm business models have yet to be established, podcasting represents a chance to bring additional revenue to a newspaper through advertising, subscription fees and licensing.
Chris Brogan and Christopher S. Penn launched the PodCamp unconference series aimed at bringing together people interested in blogging, social media, social networking, podcasting, and video on the net, and in so doing, Brogan won the Mass High Tech All Stars award for 2008.
Veteran podcaster Gary Leland joined forces with Dan Franks and Jared Easley to form a new international conference for podcasters in early 2014 called Podcast Movement. Unlike other new media events, Podcast Movement was the first conference of its size in over a decade that was focused specifically on podcasting, and has tracks for both new and experienced podcast creators, as well as industry professionals. The fifth annual conference is scheduled for July 2018 in Philadelphia, PA. 
While podcasting's innovators took advantage of the sound-file synchronization feature of Apple Inc.'s iPod and iTunes software—and included "pod" in the name—the technology was always compatible with other players and programs. Apple was not actively involved until mid-2005, when it joined the market on three fronts: as a source of "podcatcher" software, as publisher of a podcast directory, and as provider of tutorials on how to create podcasts with Apple products GarageBand and QuickTime Pro. Apple CEO Steve Jobs demonstrated creating a podcast during his January 10, 2006 keynote address to the Macworld Conference & Expo using new "podcast studio" features in GarageBand 3.
When it added a podcast-subscription feature to its June 28, 2005, release of iTunes 4.9, Apple also launched a directory of podcasts at the iTunes Music Store, starting with 3,000 entries. Apple's software enabled AAC encoded podcasts to use chapters, bookmarks, external links, and synchronized images displayed on iPod screens or in the iTunes artwork viewer. Two days after release of the program, Apple reported one million podcast subscriptions.
Some podcasters found that exposure to iTunes' huge number of downloaders threatened to make great demands on their bandwidth and related expenses. Possible solutions were proposed, including the addition of a content delivery system, such as Liberated Syndication; Podcast Servers; Akamai; a peer-to-peer solution, BitTorrent; or use of free hosting services, such as those offered by the Internet Archive or Buzzsprout.
Since September 2005, a number of services began featuring video-based podcasting including Apple, via its iTunes Music Store, Participatory Culture Foundation and Loomia. Known by some as a vodcast, or vidcast, the services handle both audio and video feeds.
Social Media: Chris Brogan, Vice President, Strategy and Technology, CrossTech Media
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