Body language is a form of non-verbal communication that conveys information through gestures, facial expressions, eye contact, posture, and appearance. It provides cues about a person's thoughts and feelings. Some examples of body language include facial expressions, eye contact, gestures, posture, and appearance. Effective use of body language involves being mindful of handshakes, eye contact, movement, and presenting oneself authentically. Body language has advantages such as intensifying communication and creating a positive atmosphere, but it also has disadvantages like being difficult to interpret across cultures and with inattentive listeners.