Back light refers to a lighting technique where the light source is positioned behind the subject, creating a silhouette effect. This method is often used in photography and film to emphasize shapes and outlines, adding depth and drama to the image. It can also highlight textures and create a sense of mystery. In addition to its artistic applications, back light is commonly used in stage lighting to enhance performances. By illuminating the background while keeping the subject in shadow, it helps to create a more dynamic visual experience. This technique is frequently employed in theater, concerts, and cinematography.