The term 'Type of Switch' can refer to two different types of switches: a DIMMER switch (6 letters) and an on/off switch (5 letters). A DIMMER switch is a type of electrical switch that allows for the adjustment of the brightness of a light. It works by reducing the amount of electricity that is sent to the light, thus dimming it. An on/off switch is a type of electrical switch that turns a device on or off. It works by either sending or cutting off the electricity to the device.