Relative Pronouns of People and Things
Pronouns are words used to avoid repetitions of a noun {see Subject Pronoums, A1 Level}. Relative pronouns are used to introduce relative clauses. They refer to people or things by replacing the subject expressed in the main clause to avoid the repetition of it in the relative clause {see Relative Pronouns, A1 level}. https://open.books4languages.com/english-a2-grammar/chapter/relative-pronouns-of-people-and-things/