What is a montage?

A montage is the assembling together of images in a film, usually in quick succession, often dissolving into one another.

It can be used to convey action and the passage of time, newspaper headlines and theater marquees flying by as a dancer rises to stardom, or, as in the work of Sergei Eisenstein, to evoke emotional responses from the viewer by juxtaposing shots in a jarring way.