Psychotherapy research focuses on studying the effectiveness, processes, and outcomes of various therapeutic approaches for mental health treatment. It explores methods like cognitive-behavioral therapy, psychodynamic therapy, and humanistic approaches to understand how they reduce symptoms and improve well-being. Research also examines therapist-client relationships, cultural factors, and long-term benefits. Findings guide clinical practice, shape evidence-based interventions, and enhance mental health care by tailoring treatments to individual needs and improving therapeutic effectiveness.