The Johari Window is a psychological tool created by Joseph Luft and Harry Ingham in 1955, designed to enhance self-awareness and improve interpersonal communication by categorizing self-perception and perceptions by others into four areas: open, blind, hidden, and unknown. It emphasizes the role of feedback and communication in expanding the 'open' area to foster better relationships and personal development, while addressing the implications of the other three areas on interactions. This model is essential for personal growth, leadership, and conflict resolution.