Sigmund Freud, an Austrian neurologist, introduced the concept of the unconscious mind in psychology. The unconscious mind is a repository for feelings, thoughts, and memories of which individuals are not consciously aware. Freud explored mental disorders, such as hysteria and neurosis, by focusing on symptoms like unexplained physical pain, emotional disturbances, and anxiety. He proposed that unresolved unconscious conflicts are the root causes of mental disorders. To understand the unconscious mind, Freud developed psychoanalysis, a therapeutic method that uses dream analysis, free association, and slips of the tongue. Dream analysis interprets an individual's dreams to uncover hidden desires and emotions. Additionally, free association involves an individual saying the first thing that comes to their mind, revealing unconscious thoughts. Similarly, a slip of the tongue is an unintentional statement that may disclose true feelings. Freud also highlighted the significant impact of early childhood experiences on personality development and mental health. Freud's ideas on the unconscious mind and the importance of early childhood experiences continue to influence psychology even today.