A two-way switch, also known as a toggle switch, is an electrical device that allows a user to control the flow of electricity in two directions. It is typically used to control a light or other electrical appliance from two different locations. The term 'two-way switch' refers to the fact that the switch has two positions, one for each direction of the current. The toggle switch is a common type of two-way switch, which is operated by flipping a lever up or down.