The Johari Window model is a tool for enhancing self-awareness, personal and group development, and interpersonal communication, created by psychologists Joseph Luft and Harry Ingham. It consists of four quadrants that represent varying degrees of known and unknown information about oneself and others, aiming to expand the 'open area' for better collaboration and trust within teams. Effective feedback and self-disclosure are essential in reducing blind and hidden areas, promoting a culture of openness and self-discovery.