Body language is an important form of non-verbal communication, conveying 55% of our communication without words through gestures, expressions, and posture. It can provide crucial context about emotions and feelings that may not be expressed verbally. Facial expressions especially communicate attitudes clearly, while eye contact, gestures, and posture also reveal personality and indicate whether someone is listening or feels defensive. Proper body language like making eye contact, having good posture but not crossing arms, and respecting personal space helps effective communication.