Back light refers to a lighting technique where the light source is positioned behind the subject being photographed or filmed. This creates a silhouette effect, emphasizing the outline of the subject while often leaving the details in shadow. It is commonly used in photography and cinematography to add depth and drama to an image. In addition to its artistic applications, back light can also enhance the visual appeal of subjects like landscapes or portraits. By highlighting edges and creating a halo effect, it can draw attention to specific features, making the overall composition more engaging and dynamic.