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one of the most basic ways to describe people is in terms of introversion and extroversion. introverts are characterized this way; they are generally low key, calm, and unexcitable--they like being alone or with only one or two other people. extroverts, on the other hand, are described in the opposite way; they are outgoing and friendly, preferring to be with others than alone--they love excitement and adventure. in other words, you'll find introverts in such activities as: having dinner with a friend in a quiet restaurant, reading, listening to a favorite cd, or working on a hobby such as stamp collecting. conversely, the extroverts will be: at a party or planning one, going to a sporting event with a group of friends and yelling the loudest, or looking for something new and exciting to do: with other people, of course. the interesting question for psychologists is this; why do people seem to fall into these two categories? psychologists don't have an however, most think the explanation is biological. that is, when we're born, something about our brains leads us to be either (an introvert or an extrovert.