Local dimming is a technology used in LCD and LED displays to enhance picture quality. It works by adjusting the brightness of specific areas of the screen independently, allowing for deeper blacks and improved contrast. This means that dark scenes can appear more detailed, while bright areas remain vibrant. By controlling the light output in different zones, local dimming reduces the halo effect that can occur around bright objects on dark backgrounds. This feature is particularly beneficial for watching movies or playing video games, as it creates a more immersive viewing experience with better overall image quality.