This document discusses relative pronouns in English. It explains that relative pronouns like who, which, that, whose, and where are used to introduce relative clauses that provide additional information about a subject or object mentioned in the main clause. It provides examples of how each relative pronoun is used - who is used for people, which is used for animals, things and abstract nouns, that can replace who and which, whose indicates possession, and where indicates place. It also notes some cases where the relative pronouns can be omitted.