A producer is a person responsible for financing the movie project. The producer is responsible for arranging all the resources needed for the making of the movie. A director approaches a producer with the proposal of a movie and if the producer sees an opportunity of making good business, then the producer decides to invest money in the project.
The producer may have a lot of influence in the movie from picking the lead actor/actress to picking the music as well. Many producers are often involved in directing the movie as well as acting as the lead for the movie. Producers pay all the fees to the cast & crew for the project and all the expenses caused in the movie project and get the profit made by the movie on the box office.
The producers of any movie also earn money through selling satellite rights and music rights to various companies.