A relative pronoun is a pronoun that marks a relative clause within a larger sentence. It is called a relative pronoun because it relates the relative (and hence subordinate) clause to the noun that it modifies. In English, the relative pronouns are: who, whom, whose, whoever, whosoever, whomever, which, what, whatever, and that.
A relative pronoun links two clauses into a single complex clause. It is similar in function to a subordinating conjunction. Unlike a conjunction, however, a relative pronoun stands in place of a noun. In this grammar lesson, Mrs. Santha A.Kumar explains the Relative Pronouns with examples.
