What is the primary function of a three way switch?

The primary function of a three-way switch is to enable the control of lights from two different locations. This is particularly useful in larger rooms or hallways where it may be inconvenient to walk back to the original switch to turn off the lights. The design of the three-way switch allows it to create a circuit that can control the same light fixture from two different points, providing flexibility and convenience for the user.

When installed correctly, the three-way switch will work in tandem with another three-way switch, allowing each to operate the connected light independently of the other. This is commonly seen in staircases, large rooms, and entrance ways, demonstrating the functionality and practical application of the three-way switch in both residential and commercial settings.