Non-verbal is a body language sign without speaking. We can see from the expression changes, and we will know without him speak. we know and use of non-verbal cues in facial expression are familiar to us nearly from birth.
A person body posture, movements and positions more often tell us exactly what they mean. Many people are unaware of how loudly they communicate with their bodies.We understand what a person indicates with their gestures and body positions and we send out our own messages.