Pronouns are words that take the place of nouns, referred to as antecedents. Common pronouns include I, me, you, he, she, it, we, and they. Pronouns must agree with and refer clearly to their antecedents. Examples are provided of pronouns correctly replacing nouns like "Halloween", "Robert", and "skateboards". The document teaches about identifying pronouns and their antecedents through examples and a short interactive quiz.