Body language refers to the nonverbal communication conveyed through facial expressions, gestures, and postures. These cues can provide insight into a person's emotions, personality, and state of mind. Some examples of positive body language in a restaurant setting include maintaining eye contact with guests, smiling, standing up straight with relaxed shoulders, nodding to show engagement in conversations, and keeping an open posture without crossed arms or hands in pockets. It is also important to avoid nervous ticks and maintain personal space.