Body language provides clues to a person's subconscious thoughts and emotions but is not an exact science. It greatly influences first impressions which are often based more on appearance than words. One should be aware of their own negative gestures like looking nervous or aggressive and avoid them, as body language signals can unintentionally "leak" the truth. Proper use of gestures, personal space, touch, posture and walking can help build confidence in communication while protecting oneself if needed.