A third type is the four way switch which is used in conjunction with two three way switches to control lighting from more than two locations. This requires a special switch.

Us 9 08 40 Off Wallpad L6 3 Gang 1 Way 2 Way Wall Light Switch Electric Power Switch Push Button With Led Indicator Grey Crystal Glass Switches
3 way switch definition. A regular switch has only two connections and simply cuts the flow of electricity through the switch or allows the current to pass through it. The three way switch is a variation of the standard single pole switch which controls a light only from one location. Electric switch electrical switch switch control consisting of a mechanical or electrical or electronic device for making or breaking or changing the connections in a circuit. The next most common is the three way switch which is commonly used to control a light fixture from two different locations. Three way switch an electric switch that has three terminals. Three way switches each have three connections and are used in tandem.
Used to control a circuit from two different locations. Three way switch definition is an electric switch having three terminals used to control a circuit from two different points. The 3 way switch was originally developed to allow users to control a light from two different locations. This configuration may be used in open plan homes or in large kitchens or great rooms where a central bank of lighting fixtures might be controlled from more than two entry points. Most common is the single pole switch the type used to control a light fixture from a single location. Used to control a circuit from two different locations.
Electric switch electrical switch switch control consisting of a mechanical or electrical or electronic device for making or breaking or changing the connections in a circuit. Three way switch an electric switch that has three terminals. Wall switches used to control ceiling light fixtures or other fixtures come in three types.