A type is a specific category of things or people that have something in common. Your favorite type of candy might be dark chocolate, while your brother's favorite type is jelly beans.
There are two basic sorts of types: first, a group of similar things — and in biology, specifically, "an organism with the essential characteristics of its group." The second type of type consists of letters, numbers, or symbols that are printed or shown on a computer screen, like the extra-large type in your grandpa's library book. As a verb, to type means to use a typewriter or keyboard to write.