Body language is a form of non-verbal communication that conveys emotions and attitudes through gestures, postures, facial expressions, and movements of the eyes, face, and body. Key aspects of body language include gestures, behaviors, emotions expressed on the face like smiles and frowns, and positions of the eyes, head, hands, and legs. Subtle cues like eye contact, crossed arms, foot tapping, and leaning can reveal feelings and attitudes even when not consciously expressed. Body language varies significantly in different cultures and contexts.