Communication is a two-way process involving the exchange of ideas between a sender and receiver to reach a mutual goal or direction. It can be categorized as oral, non-verbal, or written. The basic elements are a sender, receiver, message, medium, and feedback. Effective communication is important as it saves time, helps with coordination, and improves speaking, listening, interaction, and writing abilities. Communication networks can be internal, involving formal and informal communication styles, or external using advertising, media, public relations, presentations, negotiations, mail, telegrams, and letters.