A three point lighting is consist of a fill light, key light and back light. A fill light shines directly on an object from the side angle which eliminates shadows or shaded surfaces from the person face. Key light shines directly on the shot your taking which is determined by the angle and your lighting of your shot. A back light is mainly a light that shines from behind the object which gives the shot a better focus on the object.
One of the photo’s I picked was the one above. I like this photo because the person expression and the lighting fits the picture. The back light is on point, you can see the whole background light focusing on the person. It also has fill light in it which shows half of a shadow on the person face.