An extrovert (emphasis on "e") is a person, turned face to society, open to communication. The prefix "extra" means "outside, outside," so the word "extrovert" can be translated as "turned outward". An extrovert's antonym is an introvert - a person closed in his world and not inclined to communicate.
Sometimes a person can combine the qualities of an introvert and an extrovert. This was, for example, Freddie Mercury: on stage full extrovert and idol of millions, in his personal life he was a shy and withdrawn person.
An extrovert is in the list: Psychology