An electrical switch is a device used to control the flow of electricity in a circuit. It can either allow current to pass through, turning on a device, or stop the current, turning it off. Switches come in various types, including toggle, push-button, and rocker switches, each designed for specific applications. When a switch is activated, it creates a connection or disconnection in the circuit. This simple mechanism is essential for operating everyday devices like lights, fans, and appliances, making it a fundamental component in both residential and commercial electrical systems.