From The Art and Popular Culture Encyclopedia
Film editing is the connecting of one or more shots to form a sequence, and the subsequent connecting of sequences to form an entire movie. Film editing, by definition, is the only art that is unique to cinema and which defines and separates filmmaking from almost all other art forms (such as: photography, theater, dance, writing, and directing). The job of an editor isn’t merely to mechanically put pieces of a film together, nor to just cut off the film slates, nor merely to edit dialogue scenes. Film editing is an art form which can either make or break a film. A film editor works with the layers of images, the story, the music, the rhythm, the pace, shapes the actors' performances, "re-directing" and often re-writing the film during the editing process, honing the infinite possibilities of the juxtaposition of small snippets of film into a creative, coherent, cohesive whole.