Keyboards have keys, (labeled buttons) which tell a computer which letter or number or symbol you want to use. You can type letters and e-mail, or type in computer codes to make computers run! Most keyboards have plastic keys that you depress (push down on) to complete a circuit that tells the computer what key you are pressing.

There are different types though including some that are foldable, rollable and even just a projected image! Check out this link. (This will take you to a different web site and it does not mean you should buy one of these. It's just an interesting link.)