Holden Caulfield is the protagonist of J.D. Salinger's novel 'The Catcher in the Rye,' a character known for his deep sense of alienation and disillusionment with the world around him. As a teenage boy navigating the complexities of adolescence, Holden embodies the struggles of youth and the desire for authenticity in a world he perceives as phony, which connects to broader themes of identity, loss, and the search for meaning.