A light switch is a simple electrical device used to control the flow of electricity to a light fixture. When the switch is turned on, it completes the circuit, allowing electricity to flow and illuminate the light. Conversely, when the switch is turned off, it breaks the circuit, stopping the flow of electricity and turning the light off. Light switches come in various designs, including toggle, rocker, and dimmer types. They are typically mounted on walls and are easy to operate. The use of a light switch is essential in homes and buildings, providing convenience and safety in managing lighting, which is crucial for daily activities.