In "The Great Gatsby" by F. Scott Fitzgerald, Nick Carraway, the novel's narrator, becomes acquainted with Daisy Buchanan and her husband Tom Buchanan through various circumstances. Nick is Daisy's cousin, and this familial connection forms the initial link between them. Daisy and Nick share some history, and Nick often serves as a confidant for Daisy.
When Nick moves to West Egg, a wealthy area on Long Island, he rents a house near the mansion owned by Jay Gatsby. Daisy and Tom also live in the same area, but in East Egg, which is associated with old money. This geographical proximity allows Nick to become more intimately connected with their lives. He gets invited to their social gatherings and parties, becoming an observer of their lavish lifestyle.
Nick's relationship with Tom and Daisy becomes more complex as he learns about the issues in their marriage. Tom is having an affair, and Daisy is aware of it. This tension and the intrigue surrounding their lives draw Nick into their circle of influence, and he becomes a participant in the unfolding drama.
Nick's role in the story extends beyond being a mere observer. He plays a pivotal role in reuniting Daisy with Gatsby, who is Nick's enigmatic neighbor and the novel's central character. Gatsby's passionate pursuit of Daisy is what drives much of the plot. Nick acts as the intermediary who facilitates their reunion, which ultimately leads to tragic consequences.