Backlight refers to a lighting technique where a light source is positioned behind a subject, creating a contrast between the subject and the background. This method is commonly used in photography and videography to enhance the visual appeal of an image. By illuminating the background, backlighting can create a halo effect around the subject, adding depth and dimension. In digital displays, such as LCD or LED screens, backlighting is essential for visibility. It provides the necessary illumination for the screen to display images and text clearly. Different types of backlighting, like edge-lit or full-array, can affect the brightness and color accuracy of the display.