Communication involves the transfer of knowledge, information, and emotions from a speaker to a listener. It has several key elements, including a speaker, listener, medium, language, and feedback. Communication is important in life as it encourages critical thinking, develops self-esteem, and improves relationships. There are various types of communication, such as verbal communication which includes both written and oral forms like writing, speaking, and signing, and non-verbal communication through gestures, posture, facial expressions, and sign language.