Pronoun agreement refers to the grammatical rule that pronouns must match the nouns they replace in number, gender, and person. For example, if a noun is singular and feminine, the pronoun used should also be singular and feminine, such as using she for the girl. This ensures clarity and coherence in writing. In addition to gender, pronoun agreement also involves matching plural nouns with plural pronouns. For instance, if the noun is plural, like the students, the correct pronoun would be they. Maintaining pronoun agreement helps avoid confusion and makes sentences easier to understand.