Relative clauses are clauses which describe a noun or pronoun by means of a relative pronoun. Relative pronouns (e.g. "who", "which", "that", "whoever" ) connect a defining phrase to the word modified.
A relative clause can have a subject, verb, object and modifiers like a main sentence.
A relative clause usually functions as an adjective modifying a noun.
Relative Clause: "who", "which" clause that functions to define a noun. The relative clauses are highlighted in the following sentences.