What is the use of backlighting generally intended to achieve?

Backlighting is primarily used to create a separation from the background, which enhances depth and dimension in visual compositions. When a light source is positioned behind the subject, it often outlines the subject, making it stand out against the background. This technique is particularly effective in photography and video, as it can create a more dramatic and visually appealing image by emphasizing the contours of the subject.

The use of backlighting can also introduce an ethereal or glowing effect, making the subject appear more striking. This contrast between the illuminated edges of the subject and the darker background can help draw the viewer's attention directly to the main focal point, thereby enhancing the visual narrative of the scene.