1) The document introduces communication and discusses how humans communicate from birth through nonverbal cues like crying, facial expressions, and gestures, to developing language skills like speaking, writing, and asking questions.
2) It explains that communication is essential for sharing information, experiences, and solving problems in society. Communication allows humans to understand each other.
3) The document defines communication as the sharing of a understood message through social interaction. It discusses the five senses used in communication and different types of communication including nonverbal communication through body language, facial expressions, and gestures, as well as oral communication using language.