A traffic light is a signaling device used at intersections to control vehicle and pedestrian traffic. It typically has three colored lights: red, yellow, and green. The red light indicates that vehicles must stop, the green light means they can go, and the yellow light warns that the signal is about to change. Traffic lights are essential for maintaining order on the roads and ensuring safety for both drivers and pedestrians. They are often placed at busy intersections and are synchronized to improve traffic flow. The use of traffic lights helps reduce accidents and promotes efficient transportation in urban areas.