The three forms of communication are written, verbal and non-verbal communication. Non-verbal communication is further broken down into listening skills and body language, while verbal communication is about tone of voice as well as the actual words spoken. Written communication has evolved to include letters, memos, emails and instant messaging.
Oxford Dictionaries defines communication skills as the ability to convey or share ideas and feelings effectively. Non-verbal communication accounts for a large part of how information is exchanged. For example, when people talk on the telephone, they often use their hands and arms to express themselves, and nod or shake their heads even though the people they are talking to cannot see them.