What type of pronoun relates one part a sentence to noun or in another sentence?

The type of pronoun that relates one part of a sentence to a noun or another sentence is called a relative pronoun.

Here are some examples of relative pronouns:

* Who: "The man who lives next door is a doctor." (relates to "man")

* Whom: "The woman whom I saw at the store is my neighbor." (relates to "woman")

* Whose: "The dog whose tail is wagging is very happy." (relates to "dog")

* Which: "The car which I bought is a hybrid." (relates to "car")

* That: "The book that I am reading is very interesting." (relates to "book")

Relative pronouns introduce relative clauses, which are clauses that provide additional information about a noun.