A heist film is a type of movie about a group of people trying to steal something. Usually the group of people is made up of people who have a special skill, like being able to pick locks or crack safes. In the movie, the group of people will plan out a way to break into a place and steal something of value. Sometimes they will have to fight off bad guys and other obstacles to get away with the theft. It's usually a very exciting movie with a lot of action.