Pronouns are parts of speech that replace nouns. There are several types of pronouns including personal pronouns, demonstrative pronouns, interrogative pronouns, and possessive pronouns. Personal pronouns refer to specific people or things and include subject pronouns like I, he, she and object pronouns like me, him, her. Demonstrative pronouns point to particular nouns and include this, that, these, those. Interrogative pronouns introduce questions using words like who, what, where. Possessive pronouns show ownership with words like my, your, his, hers.