"Red Light" refers to a specific color of light that is often used in traffic signals to indicate that vehicles must stop. It is a crucial part of road safety, helping to manage the flow of traffic and prevent accidents. The color red is universally recognized as a signal for caution and danger, making it an effective choice for this purpose. In addition to traffic signals, red light is also used in various applications, such as photography and theater lighting. In photography, red light can help preserve night vision, while in theater, it can create dramatic effects. Overall, red light plays an important role in both safety and artistic expression.