Difference between independent and mainstream.

A Independent film doesnt have much funding so the quality of the filming, sound, props, special effect and editing isnt to the high standard set by a Mainstream film, due to there large budget. Also independent companies cant afford the same well known actors and genrally only have one mainstream actor to try and draw a larger audience.
Independent films also generally have a niche audience due to the fact they dont have the budget to do large scale marketing like a maintstream would.