Final answer:
An appositive serves the purpose of providing additional information in a sentence.
Step-by-step explanation:
An appositive serves the purpose of providing additional information in a sentence. It is a word or phrase that adds explanatory or clarifying information to the noun that precedes it. It helps to enhance the reader's understanding of the subject or object in the sentence. For example, in the sentence 'My friend Tom, a talented musician, is performing tonight', the appositive 'a talented musician' provides additional information about the noun 'Tom