A montage creates a whole out of fragmented bits. In movies, directors shoot short sequences and splice them to create a story line (this is why director’s say “cut”). A classic example is the Odessa Steps sequence in Battleship Potemkin (1925). Director Eisenstein cuts from shots of soldier’s boots to people fleeing to a tumbling baby carriage. By themselves, they have no relation; in sequence, they portray the brutal suppression of a protest. The sequence has since been alluded to in many movies. It’s polar opposite is Rope, which Alfred Hitchcock shot in 1 take.