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There are documentary films made for Nat Geo, Animal Planet, Discovery, History Channel, etc., which are purely made-for-TV.
Then there are those which were made for theatrical release and became successful, such as Fahrenheit 9/11, March of the Penguins, An Inconvenient Truth, etc.
Documentaries are basically non-fiction films which document aspects of realities from either day-to-day life or historical/biological aspects. It is basically a film medium, broadly categorised in the manner of release - either as a TV show/series, or as a movie.
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"If you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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