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 the light to illuminate. 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 an essential part of residential and commercial electrical systems. Proper installation and use of light switches enhance safety and convenience in managing lighting in spaces.