The number of local dimming zones on TVs indicates how many separate areas on the screen can be independently dimmed or brightened. This technology allows better control of the backlighting in different parts of the screen, resulting in significantly better contrast and deeper blacks. The higher number of zones usually means that the TV can control the lighting more precisely, giving a sharper, more detailed picture, especially in high contrast scenes. This feature is very important for improving the overall quality of the display.