Answer:
Adjective clause.
Step-by-step explanation:
An adjective clause is a type of dependent clause which limits the noun or pronoun it modifies.
It performs the same function as an adjective even though it is a collection of words instead of just one word.
They usually start with a relative pronoun such as that, which, when, where, who, etc.
An example is "Christian has a friend whose son lives in Israel."