Depth of field is the the range of distance within which all objects will be in sharp focus in a scene.

Shallow focus shots have a part of the shot that is in focus but the rest of the shot is not in focus. Whereas a deep focus shot is where every part of the shot is in focus.

Depth of field has been used in this scene from the film Hunt For the Wilderpeople to show off the natural environment and setting of the film fully, using a deep focus shot.