The document provides information about documentary films, including their history and examples. It notes that documentaries were originally called "actuality films" and were short clips documenting aspects of reality. Over time they became longer to include more information. Different styles of documentaries have emerged since YouTube's creation in 2005. Examples discussed include crisis (1963) and various documentaries by filmmakers like Robert Drew, Lucy Walker, and Asif Kapadia. Steps for making engaging documentaries are also outlined, along with different documentary types.