Pronoun

What is a Pronoun?

A pronoun can replace a noun or another pronoun. You use pronouns like "he," "which," "none," and "you" to make your sentence less cumbersome and less repetitive.
Grammarians classify pronouns into several types, including the personal pronoun, the demonstrative pronoun, the interrogative pronoun, the indefinite pronoun, the relative pronoun, the reflexive pronoun, and the intensive pronoun.


http://www.arts.uottawa.ca/writcent/hypergrammar/pronouns.html