Two way switch The 2-way switch acts as 2 switches that can control a single lamp. You might ask yourself, why do we need 2 switches for a single appliance when we have one? The two-way switches are generally used for staircase lightning and other lightning systems where we want to take control of appliances from two different locations. Suppose you are on the top of stairs and want to turn on the light above the stairs, then using the 2 way switch you can turn on/off the same lamp with two different or locations. ...