The document discusses different types of communication. It defines communication as the transfer of information between entities through various means. Effective communication is efficient, successful, useful, and valuable in conveying intended messages. There are different modes of communication including non-verbal communication through body language and gestures, visual communication through presentations and images, oral communication through speaking, and written communication through memos, emails, letters and other documents. Proper structure, grammar, style and proofreading are essential for effective written exchanges of information. The overall document emphasizes the importance of understanding audience and purpose across various communication channels.