From The Art and Popular Culture Encyclopedia
Third-person narrative is one of three possible modes of narration. The others are first-person narrative, in which the narrative voice is the protagonist of the narrative, referred to in the first person, as I or we, and (rarely) second-person narrative, in which the protagonist is rembered and said as second person, as "you". Third person can be omniscient or limited. It depends on how many thoughts you know from each character.
Third person, limited
Third person, objective
The author does not enter a single mind, but instead records what can be seen and heard. This type of person is like a camera or a fly on the wall. This is used by journalists in articles—it only gives the facts, from one fixed perspective.
Third person, omniscient/dramatic