Android "Froyo" is a codename of the Android mobile operating system developed by Google, spanning versions between 2.2 and 2.2.3. Those versions are no longer supported. It was unveiled on May 20, 2010, during the Google I/O 2010 conference.
One of the most prominent changes in the Froyo release was USB tethering and Wi-Fi hotspot functionality. Other changes include support for the Android Cloud to Device Messaging (C2DM) service, enabling push notifications, Additional application speed improvements, implemented through JIT compilation and displayed within applications as top-of-the-screen banners.
As of January 9, 2016 statistics issued by Google indicate that less than 0.1% of all Android devices accessing Google Play run Froyo, effectively meaning that this version is no longer in use.