Computers use gates to decide what to do with certain information. There are lots of different gates in computers but, today we will do the basic gates. AND gates, OR gates and, NOT gates A gate is when two inputs, enter the gate. After that, the gate will decide what single output there will be. There are only 4 different inputs a gate can have. 1 0, 0 1, 1 1 or, 0 0. Logic gates use transistors to function. A transistor is a small semiconductor used to as a switch for gates. The thing with transistors is that when the transistor is on it is on and, if it is off it is off. That's how we can use it with gates.