Communication is the exchange of information between individuals using common symbols. It has several purposes like collecting data, initiating interventions, and evaluating outcomes. There are different levels of communication ranging from casual acquaintances to close friends. Effective communication requires skills like active listening, empathy, and being knowledgeable. Barriers can occur at physiological, psychological, environmental, and cultural levels. Maintaining good nurse-patient relationships and providing effective patient teaching are important aspects of communication in healthcare.