The document introduces the Johari Window model, which is a tool for self-awareness, personal development, and understanding relationships. The model uses a two-by-two grid to divide information about a person into four categories: open self, blind self, hidden self, and unknown self. These categories are based on what aspects of oneself are known to oneself and others. The document explains how the model can be used to facilitate communication, personal growth, and building trust between individuals.