The documentary genre has radically evolved in recent years and so it’s not a surprise that there may be some confusion about “what exactly is a documentary!
A documentary is a broad term to describe a non-fiction movie that in some way “documents” or captures reality.
Documentaries are often used to reveal an unusual, interesting or unknown angle. Topics are limited only by one’s imagination as you can see by this huge list of documentary ideas submitted by visitors to this site.
Documentary filmmakers are often motivated to make their films because they feel a particular story or viewpoint is not being (adequately) covered by mainstream media.