Backlighting
When the light source is on the other side of the subject from the camera, the resulting image has what is known as backlighting. It indicates that the area behind the subject is receiving a greater amount of light than the area directly in front of the subject. In order to heighten the drama of a subject, to create a silhouette or rim-lighting effect, or to isolate the subject from the background, this technique is frequently utilized.
Do you have a better definition? Share it in the comments.