In film or video, an over the shoulder shot - AKA an over shoulder, ab tu, OTS, or even third-person shot - gives the perspective of looking over the shoulder of another person. The camera is positioned behind the back of the shoulder and head, however, their head and shoulder are used to frame the image. 

The OTS shot is used often when two characters are having a discussion, usually following a wide establishing shout which helps the audience members get a sense of ‘where’ the exchange is taking place. The where in this example is the setting.