More precisely, it is a documentary mixed with fictional elements, in real time, filmed when the events take place, and in which the main character or characters — often portrayed by non-professional or amateur actors — are essentially playing themselves, or slightly fictionalized versions of themselves, in a fictionalized scenario. In this sense, docufiction may overlap to an extent with some aspects of the mockumentary format, but the terms are not synonymous.
A film genre in expansion, it is adopted by a number of experimental filmmakers.
The neologism docufiction appeared at the beginning of the 21st century. It is now commonly used in several languages and widely accepted for classification by international film festivals.
In the domain of visual anthropology, the innovating role of Jean Rouch allows one to consider him as the father of a subgenre called ethnofiction. This term means: ethnographic documentary film with natives who play fictional roles. Making them play a role about themselves will help portray reality, which will be reinforced with imagery. A non-ethnographic documentary with fictional elements uses the same method and, for the same reasons, may be called docufiction.
In contrast, docudrama is usually a fictional and dramatized recreation  of factual events in form of a documentary, at a time subsequent to the "real" events it portrays. A docudrama is often confused with docufiction when drama is considered interchangeable with fiction (both words meaning the same). However, "docudrama" refers specifically to telefilms or other television media recreations that dramatize certain events often with actors.
A mockumentary is also a film or television show in which fictitious events are presented in documentary format, sometimes a recreation of factual events after they took place or a comment on current events, typically satirical, comedic or even dramatic.  Whereas mockumentaries are usually fully scripted comedies or dramas that merely adopt some aspects of documentary format as a framing device, docufictions are usually not scripted, instead placing the participants in a fictionalized scenario while portraying their own genuine reactions and their own improvisational dialogue and character development.
^Note, however, that Flaherty's earlier film, Nanook of the North from 1922, incorporates many docufiction elements, including the "casting" of locals into fictitious "roles" and family relationships, as well as anachronistic hunting scenes.
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