Pegah Ahangarani at the Film Festival in Paris.

Provide a test screening platform for movies.

This is such a huge advantage to filmmakers. Film festivals give them platforms to test their movies against an audience of viewers. The reaction and response of the audience to the movie will determine whether they can release the movie as it is or go back and make certain edits and changes to improve the film. This is an amazing way to test out the quality of work before putting it out. It draws the filmmaker's attention to certain errors or subpar clips and allows them to go back and correct them.