Body language is a form of nonverbal communication through physical behaviors like facial expressions, posture, gestures, eye movement, touch, and use of space. It conveys thoughts, intentions, and feelings and makes up 55% of communication, compared to 7% through words and 38% vocally. The document focuses on interpreting human body language through the eyes, face, postures, and common gestures and how they can indicate emotions, create rapport and trust, and determine when someone is lying. It also provides tips on how to use body language to be attractive and ensure you are not interrupted.