Body language is a silent orchestra, as people constantly give clues to what they’re thinking and feeling. Non-verbal messages including body movements, facial expressions, vocal tone and volume, and other signals are collectively known as body language.

Microexpressions (brief displays of emotion on the face), hand gestures, and posture all register in the human brain almost immediately—even when a person is not consciously aware they have perceived anything. For this reason, body language can strongly color how an individual is perceived, and how he or she, in turn, interprets others’ motivation, mood, and openness. It's natural to mirror; beginning as soon as infancy, a newborn moves its body to the rhythm of the voice he hears.