Adjectives Clauses/ Relative Pronoun (meaning)

Clause:
A clause is a group of words containing a subject and a verb.

Independent Clause:
An independents clause is a complete sentence. It contains the main subject and verb of a sentence. (It is also called "a main clause.")

Independent Clause:
A dependent clause is not a complete sentence. It must be connected to an independent clause.

Adjective Clause:
An adjective clause is a dependent clause that modifies a noun. It describes, Identifies, or gives further information about noun. (An adjective clause is also called "a relative clause".)

Adjective Clause Pronouns;
An adjectives clause uses pronoun to connect the dependent clause to the independent clause. The adjective clause pronouns are who, whom, which, that, and whose. (Adjective clause pronouns are also called "relative pronoun.")

Taken from: Understanding and using English grammar