Non-defining relative clauses (also known as non-restrictive relative clauses) give us more information about a noun. Non-defining relative clauses do not define or identify the noun. Non-defining relative clauses are common in written English. Example: ... We link the relative clause to the noun with a relative pronoun.
Adjective clauses (or relative clauses) are a type of subordinate clause that act as adjectives. The whole clause does the job of an adjective. Adjectives modify nouns and pronouns. Clauses are groups of words that contain both a subject and a verb.
