The document discusses various barriers to effective communication. It identifies four main categories of barriers: physical, people-related, physiological, and psychological. Physical barriers include noise, poor acoustics, interruptions, and uncomfortable environments. Physiological barriers relate to a person's health or disabilities that can impact listening or speaking. Psychological barriers involve a listener's preconceptions, anxieties, attitudes, impatience, or beliefs that prevent full engagement. The document provides examples and explanations for barriers in each category.