system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What does a a movie producer actually do for the movie?

Are they just putting up the money for production? What does an executive producer do?
gpt
Typically EPs are ones that just put up money. Producers do a ton of work. They are the general managers of a film. They manage the budgets, all the stars, the director, organize everything on the set, ensure they stick to the production schedule, determine how to handle cost overruns, etc etc. 

If Da Vinci was a director then the producer would be the person who got him a studio, his supplies, his assistants, negotiated price for paintings, finding buyers, etc.