Every fiction writer beyond the beginner stage knows about point-of-view.  It’s the perspective from which a story is told.  It’s the eyes through which we are seeing, the ears through which we are hearing, the mind through which we’re processing, the heart through which we’re feeling.

POV is mostly the protagonist’s, but it can also be any other character’s (as in multi-POV), an observer’s (think Nick Carraway), or even the author’s.  The prime directive of POV is also well known: keep it consistent, no head hopping within a scene

http://writerunboxed.com/2017/01/04/immersive-pov/