A pronoun is a word that takes the place of a noun. There are different types of pronouns including personal pronouns, subject pronouns, object pronouns, possessive pronouns, and indefinite pronouns. Personal pronouns refer to people or things and can be used as subject or object pronouns depending on their use in a sentence. Subject pronouns are used as the subject of a sentence while object pronouns are used as the direct or indirect object. Possessive pronouns show ownership and indefinite pronouns do not refer to a specific person, place, or thing.