When something is typical, it is common, regular, expected — hanging out with friends and playing computer games are typical activities of American teens.
To be typical is to be of a type, meaning that a person or thing has the same characteristics of everyone or everything else in the group, like a typical student, trying to talk the teacher out of giving homework over break. Something that is typical is what you can expect, like reading a guidebook about a faraway country you will visit to learn the typical weather and kinds of food you will encounter while you are there.