The term "4:3" refers to an aspect ratio commonly used in television and computer screens. It indicates that for every four units of width, there are three units of height. This ratio was standard for older televisions and computer monitors, providing a more square-shaped display compared to modern widescreen formats. In the context of video and photography, 4:3 is often used for capturing images and videos that fit this traditional format. While it has largely been replaced by wider ratios like 16:9, the 4:3 aspect ratio is still relevant in certain applications, such as digital photography and classic films.