pronoun is a word which take place of a noun in a sentence. there are eight different types of pronouns which are (1) demonstrative pronouns (2) interrogative pronouns (3) indefinite pronouns (4) possessive pronouns (5) reflexive pronouns (6) intensive pronouns (7) relative pronouns and (8) personal pronouns.
personal pronouns have further three categories,
(1) first person personal pronouns
(2) second person personal pronouns
(3) third person personal pronouns