what are relative pronouns?
A Relative Pronoun points or refers to the noun going before it, which is called its antecedent.
Example: I have bought the book that I wanted.
Here, the pronoun 'that' relates to the noun going before it i.e. to 'the book'
Other examples of relative pronouns are 'which', 'when', 'who' (whom, whose) and 'where'.