Body Language

Body language refers to various forms of non-verbal communication, wherein a person may reveal clues as to some unspoken intention or feeling through their physical behaviour. These behaviours can include body posture, gestures, facial expressions, and eye movements. Although this article focuses on interpretations of human body language, also animals use body language as a communication mechanism. Body language is typically subconscious behaviour, and is therefore considered distinct from sign language, which is a fully conscious and intentional act of communication.

Body language may provide clues as to the attitude or state of mind of a person. For example, it may indicate aggression, attentiveness, boredom, a relaxed state, pleasure, amusement, and intoxication.
Body language is significant to communication and relationships. It is relevant to management and leadership in business and also in places where it can be observed by many people. It can also be relevant to some outside of the workplace. It is commonly helpful in dating, mating, in family settings, and parenting. Although body language is non-verbal or non-spoken, it can reveal much about your feelings and meaning to others and how others reveal their feelings toward you. Body language signals happen on both a conscious and unconscious level.

Read more on Wikipedia.