The Johari Window is a psychological tool created by Joseph Luft and Harry Ingham in 1955. It helps individuals understand their self-awareness and interpersonal relationships. The model consists of four quadrants: the Open Area, Blind Area, Hidden Area, and Unknown Area, each representing different aspects of self-knowledge and feedback from others. By sharing information and receiving feedback, individuals can expand their Open Area, leading to better communication and collaboration. The Johari Window is often used in team-building exercises and personal development to enhance understanding and trust among group members.