How do 3-Way Light Switches Work? Also, let's look at 4-Way Switches, and Basic Light Switches! We use light switches every day, and yet have you ever seen the inside of one? In this video we open up 3 types of light switches: the basic light switch, 3-Way light switches, and 4-Way light switches. We also explore how they can be wired together to turn on one or multiple lights.