Film editors take raw footage from movie productions and edit it together into a coherent story by selecting the best shots, angles, and performances and arranging them in the proper order. They add elements like music, sound effects, and visual effects to enhance scenes. The editing process involves transferring footage to computers, reviewing takes to find the best combinations, piecing the film together, adding sound, making corrections, and preparing the final cut for the director. Successful film editors develop complex skills in using digital editing systems and a strong understanding of filmmaking techniques.