Sigmund Freud was an Austrian neurologist and the founder of psychoanalysis, a groundbreaking approach to understanding the human mind and behavior. Born in 1856, Freud developed influential theories about the unconscious mind, dream interpretation, and the role of childhood experiences in shaping personality. His works, including The Interpretation of Dreams, transformed modern psychology and had a profound impact on fields such as psychiatry, literature, and cultural studies. Freud remains one of the most important and widely discussed thinkers in the history of psychology.