The book presents a systematic theory that dreams represent disguised wish-fulfillments arising from unconscious mental processes. It distinguishes latent dream-thoughts from manifest dream-content and describes the mental operations that transform one into the other—condensation, displacement, representability, and secondary revision—while demonstrating methods of interpretation such as free association. Drawing on numerous case examples and the author's own dreams, it links dream formation to broader psychopathology, especially neurotic symptoms, and emphasizes symbolism, childhood experiences, and sexual drives as formative influences, proposing dreams as a window onto unconscious motives and psychic conflicts.