The Johari Window is a tool for self-awareness and building trust between individuals. It involves four "windows" that represent different levels of openness between a person and others: the open arena (known to self and others), blind spot (known to others but not self), facade (known to self but not others), and unknown (unknown to both self and others). Providing feedback and disclosure to others can help expand awareness and the open arena while reducing the blind spot and facade.