The Angle of View is a term that is used to describe what the camera sees when pointed at a particular scene.
The human eye has a much wider view than most camera lenses, especially when you stand next to a camera, look with your own eyes at a scene and then look into the camera to compare. You'll generally see a much wider view of the scene with your own eyes. The angle of view that the camera sees will be directly related to the lens itself. A fixed lens, or prime lens, will have a millimeter rating that will help give you a ball park estimation of what angle of view you'll see when you put the lens on the camera. Wider angle lenses will have lower millimeter numbers such as 10mm or 18mm.