A possessive pronoun is a type of pronoun that shows ownership or possession. It replaces a noun to indicate that something belongs to someone. Common possessive pronouns include my, your, his, her, its, our, and their. For example, instead of saying "the book of John," you can say "his book." These pronouns help avoid repetition in sentences. For instance, instead of saying "This is Sarah's car. Sarah loves her car," you can simplify it to "This is Sarah's car. She loves it." Using possessive pronouns makes communication clearer and more efficient.