Interpersonal communication is the process by which people exchange information, feelings, and meaning through verbal and non-verbal messages: it is face-to-face communication. Interpersonal communication is not just about what is actually said - the language used - but how it is said and the non-verbal messages sent through tone of voice, facial expressions, gestures and body language.
When two or more people are in the same place and are aware of each other's presence, then communication is taking place, no matter how subtle or unintentional. Without speech, an observer may be using cues of posture, facial expression, and dress to form an impression of the other's role, emotional state, personality and/or intentions. Although no communication may be intended, people receive messages through such forms of non-verbal behaviour.