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

An object pronoun serves the important function of replacing an object noun in a sentence, particularly after a verb or a preposition. This helps to avoid repetition and makes sentences clearer and more concise. For example, instead of saying "I saw Sarah at the park," one could use the object pronoun to say "I saw her at the park," where "her" replaces the noun "Sarah." This use of object pronouns is essential in keeping the flow of language smooth and reducing redundancy in communication.