Mockumentaries often use humor or satire as their main elements, but they can also be used to explore more serious issues. For example, the documentary "The Office" (2005) uses humor to explore the everyday lives of office workers, while the documentary "Fooled Again!" (2006) uses satire to explore the gullibility of the public.
Mockumentaries have been around since the early days of film, but they became increasingly popular in the 1980s and 1990s. Some of the most famous mockumentaries include "This is Spinal Tap" (1984), "The Blair Witch Project" (1999), and "Borat" (2006).