There are two way, three way, and four way switches and they all require different wiring techniques. The type of switch is dictated by the number of wires attached to it. Two wires for two way, three wires for three way, and four wires for four way. Two way switches control a single light from one location and are fairly simple to wire. Three way switches control a single light from two locations and are a bit more tricky. And four way switches control a single light from three locations - and are the most complex to wire.