What is the role of an object pronoun in a sentence?

An object pronoun serves the specific function of replacing a noun that typically receives the action within a sentence. In grammatical terms, object pronouns (such as "me," "you," "him," "her," "us," and "them") are used to refer to the person or thing that is affected by the action of the verb. For example, in the sentence "She gave me the book," the pronoun "me" replaces a noun that would receive the action of giving. This clarification makes the sentence smoother and avoids repetition while maintaining clarity about who is receiving the action. This role is distinct from other grammatical functions, such as showing possession or acting as the subject of a sentence, which belong to different parts of speech.