In electrical engineering, a switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another.

The mechanism of a switch may be operated directly by a human operator to control a circuit (for example, a light switch or a keyboard button), may be operated by a moving object such as a door-operated switch, or may be operated by some sensing element for pressure, temperature, or flow.A relay is a switch that is operated by electricity. 

Light switch

This light switch is made by the UK company Enco Group Limited and is its model EC 262610 which it describes as a 2-way 10AX switch 1 gang slimline curved edged design BSEN60669-1:2000.The British Standard 60669 is the standard for 'switches for household and similar fixed-electrical installations'.