Introduction to Communication defines communication as the exchange of ideas, messages, and information between two or more people through a shared medium so that they develop a common understanding. Communication serves several functions, including control, social interaction, motivation, emotional expression, and information dissemination. There are various types of communication categorized by mode (verbal and nonverbal) and people involved (intrapersonal, interpersonal, group, organizational, mass). Verbal communication can be oral (spoken) or written, while nonverbal communication involves body language, use of space, time, touch, and appearance. Both have advantages and disadvantages depending on the context and purpose.