Producers typically manage the logistics and business operations of the production.The producer generally supervises the pre-production, production and post-production stages of filmmaking. One of the most important tasks is to hire the key crew members.
The producer is tasked with making sure the film is delivered on time and within budget, and has the final say on creative decisions. It is typically the producer who oversees the marketing and distribution.
Different types of producers
Executive producer: They manage the other producers working on the same project to make sure that the producers are fulfilling their roles assigned to them. Typically they are also in charge of managing the film's finances and the handling of all other business aspects of the film.
Line producer : Manages the staff and day-to-day operations, and oversees the technical aspect that is involved in the making of a film . The line producer can be credited as "produced by" in certain cases.