A noun or noun phrase that renames another noun beside it.
Appositive phrases can be used to explain or modify the noun or pronoun.
The girl, Kailah, is sitting beside me.
The boy, Marquez, is trying out for the wrestling team.
Her dog, a black and white beagle, was outside.
The insect, a spider, was on her window.
Amber, her best friend, came back from vacation today.