One way in which personality dimensions are categorized is on the continuum between introversion and extroversion. Extroverts draw energy from spending time with other people and feel bored spending time alone. Extroverts like to talk about concepts rather than sit alone and think about them; they also tend to think as they speak.
Extroverts seek out social situations and are interested more in the external world than the world of their own thoughts. Extroverts can also be shy or suffer from social anxiety, in which case they crave the company of other people but feel anxious, uncomfortable or afraid when they are with people.