Here's is what About.com says:
Contrary to what most people think, an introvert is not simply a person who is shy. In fact, being shy has little to do with being an introvert! Shyness has an element of apprehension, nervousness and anxiety, and while an introvert may also be shy, introversion itself is not shyness. Basically, an introvert is a person who is energized by being alone and whose energy is drained by being around other people.Introverts are more concerned with the inner world of the mind. They enjoy thinking, exploring their thoughts and feelings. They often avoid social situations because being around people drains their energy. This is true even if they have good social skills. After being with people for any length of time, such as at a party, they need time alone to "recharge."
When introverts want to be alone, it is not, by itself, a sign of depression. It means that they either need to regain their energy from being around people or that they simply want the time to be with their own thoughts. Being with people, even people they like and are comfortable with, can prevent them from their desire to be quietly introspective.
Being introspective, though, does not mean that an introvert never has conversations. However, those conversations are generally about ideas and concepts, not about what they consider the trivial matters of social small talk.
Or check out the top-5-things-every-extrovert-should-know-about-introverts/ click on the link to read the more involved explanations of these 5 points.
1. If a person is introverted, it does NOT mean they are shy or anti-social.
2. Introverts tend to dislike small talk.
3. Introverts do like to socialize – only in a different manner and less frequently than extroverts.
4. Introverts need time alone to recharge.
5. Introverts are socially well adjusted.Read what WIKIPEDIA says: Introverts, in contrast, are seen as introspective, quiet and less sociable. They are not necessarily loners but they tend to have a smaller number of friends. Introversion does not describe social discomfort but rather social preference: an introvert may not be shy but may merely prefer fewer social activities.
I rest my case! Thanks for reading and commenting, even if I do disagree sometimes. I am NOT always right, sometimes I need to give my opinion.