"Die Traumdeutung" by Sigmund Freud is a book published in 1899. In this groundbreaking work, the founder of psychoanalysis introduces his theory of the unconscious through dream interpretation. Freud argues that dreams are forms of wish fulfillment, shaped by unconscious forces and mental censorship. He distinguishes between a dream's manifest content—what we remember—and its latent content—the hidden meaning beneath. Through this analysis, Freud proclaimed dreams as "the royal road" to understanding the unconscious mind.