Answer:
Appositives
Explanation:
Appositives are nouns, pronouns or phrases that rename, identify or give further information of another noun placed right beside it. There are two types of appositives: restrictive or nonrestrictive. A restrictive appositive is one that it's not essential to the sentence, and therefore should be set off with commas, dashes or brackets, while a nonrestrictive appositive is essential to the meaning of the sentence and does not require to be separated by any type of punctuation.
Here are some sentences having appositives phrases (underlined):
James, my younger brother, is a baseball player.
While I was having lunch, Fede, the introvert of our class, came to talk to me,
My cousin Eli is traveling to Europe this weekend.
