A touch switch is a type of switch that only has to be touched by an object to operate. A touchscreen includes an array of touch switches on a display. A touch switch is the simplest kind of tactile sensor.

A capacitance switch needs only one electrode to function. The electrode can be placed behind a non-conductive panel such as wood, glass, or plastic. The switch works using body capacitance, a property of the human body that gives it great electrical characteristics. The lamp keeps charging and discharging its metal exterior to detect changes in capacitance. When a person touches it, it increases the capacitance and triggers the switch.