An adjective clause, also known as an adjectival, or relative clause is a dependent clause that modifies a noun or a pronoun. In effect, this clause functions as one part of speech: the adjective.

Adjective clauses will always begin with a relative pronoun such as that, which, who, whom, whose or with a relative adverb (where, to describe place, when, to describe time, or why, to describe reason) These subordinators connect the clause to the noun or pronoun it modifies.

Examples are given.