So really, this switch is just a 2-wire switch. These mechanical devices have 4 legs, which may make you think that there are 4 wires that are switched on and off, but in fact, two on each side are actually connected together inside. These little switches are a 1/4" on each side, cost about 25 cents, and can plug directly into a breadboard. We'll be primarily using 6mm tactile button switches.
Light switches are great but we need something smaller. The flat bar that goes verically down the middle is what is physically moved to connect or disconnect. The two wires connect to the top and bottom. In this photo, you can see the internals of a light switch. On the right, the switch is closed, current flows and the light turns on. On the left, the switch is open and no current flows. When off, the two wires are disconnected. When on, two wires are connected inside, which allows current to flow. A light switch is a simple device with two positions, on and off. One kind of switch you use every day is a light switch. You're probably familiar with switches, there's tons of them in your house.
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