What is the role of a pronoun in a sentence?

A pronoun serves the essential function of replacing a noun in a sentence, which helps avoid repetition and makes writing more fluid. For example, instead of saying "Maria went to Maria's house," one can say "Maria went to her house," thus using 'her' as a pronoun to substitute for the noun 'Maria.' This substitution allows for clearer communication, making sentences less cumbersome and easier to read. Using pronouns correctly is crucial in maintaining coherence in writing and ensuring that readers can follow along without confusion.