Film distribution is the process of making a movie available for viewing by an audience. For commercial projects, film distribution is usually accompanied by film promotion.
This is an example of a distribution company which is very successful in the films it produces.
Filmmaking (or, in an academic context, film production) is the process of making a film, generally in the sense of films intended for extensive theatrical exhibition.
This is an example of a production company that is very successful which produces a lot of films which makes it to the cinemas around the world.