documentaries don't usually involve directing actors,working closely to an original script but they require more attention to questions of balance,getting the facts correct,historical truth etc
They have to. Just like actors have to join the Screen Actors Guild. Well they don't have to, but they do if they want to get any major studio funding.
One is the film who does films like harry potter hulk batman dark night and iron man or more. The other does cartoon and adverts . By India123girl does that answer your question ?