Documentaries are non-fiction films that are made to inform audiences about real people, places, events, and topics. They come in many subgenres, such as nature, history, science, and urban documentaries. Popular documentary creators like the BBC and Discovery Channel focus on specific types of documentaries - the BBC is known for nature documentaries while Discovery focuses on science. Iconic documentary filmmakers like David Attenborough and programs they've created, like Planet Earth, are considered some of the best examples of the genre. Modern documentaries satisfy audiences' desires to learn about other cultures and environments from the safety of their own homes. Different channels now specialize in different subgenres to cater to varied audience interests.