A stoplight, also known as a traffic light, is a signaling device used at intersections to control the flow of 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. Stoplights are essential for road safety, helping to prevent accidents by regulating when cars and pedestrians can move. They are often found at busy intersections and are designed to be easily visible to drivers and pedestrians, ensuring everyone can follow the traffic rules effectively.