Perspective is how to give the impression of an object in a photo so that it looks like it has a spatial dimension. The method is to use the vanishing point. The vanishing point is the position where an object goes further back and the smaller it appears. For example, when photographing a road, the further back you go the road will appear smaller.
Source : www.unsplash.com
The photo above shows 1 vanishing point where the bridge and tree are the vanishing points of the photo.
The photo above shows a 2 point perspective formed with the screen at the back of the person walking and the screen appears to narrow to the right and left.