Introvert: 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."
definition of introvert from here.