Press the button next to the lit LED to turn it off and turn on the other one.
This circuit is known as a "flip-flop" due to the way it operates. Variations of this circuit form one of the basic building blocks for computers. This circuit can be thought of as a memory because it only changes states when you tell it to, it "remembers" what you told it to do, even though you let go of the button. By combining several of these circuits, you can remember a letter or number. A typical computer has thousands of flip-flops, in miniaturized form.
