The direction of the camera's POV as a scene is being filmed. The camera angle is determined by the Director and the DP. This perspective also corresponds to that of the viewer establishing a relationship between the object that is being filmed and the audience. Employing different camera angles offer control of composition, aesthetics and can bring heightened or differentiated psychological aspects to the shot/scene.
Every visual point of view is the point of view of a soul. -- Béla Balász
Soviet Revolution era directors (e.g. Sergei Eisenstein or Vsevolod Pudowkin) were the first to utilize extreme camera angles. Eisenstein depicted members of the bourgeoisie as arrogant and condescending, making their cruelty felt by the viewer by employing low angle shots (Siegfried Kracauer). Heroes of the revolution were also filmed from a very subtle low angle, which increased their heroism and stature. By moving the camera, the perspective of a scene can also be modified. Gaining Perspective in film is about create space within a 2 dimensional composition, this means giving 2 dimensional objects a 3 dimensional from a subjective perspective lending it depth. (e.g. staggering elements in the picture, consciously distinguishing fore- and background using artificial lighting accents.)