shot-reverse-shot

A shot-reverse-shot are normally used when two characters are in conversation. These type of shots are small shots edited together to switch between characters when they are talking to each other. It also uses close up shots back and forth from opposite angles so that it is easy for the viewer to make out that they are talking to each other without actually showing a clip of them talking.

Here is a good example of this, the two characters are talking to each other but are not in a single shot, the camera switches between clips from different angles, showing the person that is talking.