Body language is a form of non-verbal communication consisting of posture, gestures, facial expressions, and eye contact. It includes three main components: gestures with the arms and hands, stance or how one stands, and facial expressions involving the eyes, mouth, and facial muscles. Effective body language uses eye contact, open stances like the leg cross, and natural smiles to connect with an audience without nervous habits or fake expressions. Mastering body language can help speakers convey their message loudly without words.