An editor selects and arranges shots to convey meaning to the audience. There are four main transition types - cut, dissolve, fade, and wipe. A cut is the most common and invisible transition, while a dissolve mixes one shot out as another mixes in to show a connection. Fades signal changes in time/space. Wipes push one image offscreen to change location. Transitions should be used purposefully to advance the narrative or develop characters and ideas through continuity or montage editing styles.