What is the third person omniscient narrator?

A narrator that tells the story not as a character but as a being that knows every aspect of the story and has no real bias. It is hard to explain but omniscient means all-knowing and third person is told from the view of a on-looker, existent or not.

the lowest among the social higher rank were the working class. this class remained detached to the political progression   of the country and was hostile to the other two classes

d: social contract theory