What is the function of Nelly dean in Wuthering Heights?

Nelly Dean is the narrator and housekeeper in "Wuthering Heights" who serves as a confidante and observer of the characters' lives. She provides insight into the complicated relationships and events that unfold at Wuthering Heights and Thrushcross Grange. Nelly's perspective shapes the storytelling and helps to reveal the motivations and emotions of the characters.