Clinical psychology focuses on understanding, assessing, and treating behavioral and psychological disorders. It uses psychological principles to alleviate, predict, and understand aspects of human functioning related to health and dysfunction. Clinical psychology has evolved from philosophy and developed as a distinct discipline with the first psychological laboratory in 1879 and first psychological clinic in 1896. It continues evolving due to influential theorists like Freud and through research and the scientific method. Research and statistics play a significant role by enabling clinical psychologists to collect data to understand human behavior and improve diagnoses and treatments. Clinical psychology differs from related fields like psychiatry, social work, and school psychology in its training, practice characteristics, and integration of clinical knowledge, theory, and science to promote well-being.