A pronoun is a word that takes the place of a noun in a sentence. Instead of repeating a noun, we use pronouns to make our speech and writing smoother. For example, instead of saying "Sarah loves Sarah's dog," we can say "Sarah loves her dog." This makes the sentence easier to read and understand. There are different types of pronouns, including personal pronouns like "I", "you", and "they", which refer to specific people or things. Other types include possessive pronouns like "mine" and "yours", which show ownership. Using pronouns helps us communicate more clearly and efficiently.