"Dream Psychology" is a seminal work by Sigmund Freud, published in 1899 as "Die Traumdeutung" in German and later translated into English. In this book, Freud explores the significance of dreams and their interpretation in the context of psychoanalysis. He posits that dreams are manifestations of unconscious desires, fears, and conflicts, and by analyzing them, individuals can gain insight into their innermost thoughts and motivations. Freud introduces concepts such as dream symbolism, the latent and manifest content of dreams, and the role of the unconscious mind in shaping dreams.