It is very essential to have the ability to read and understand another person's body language. Listening only to the words the other person is saying is not always enough. His or her body language can always tell if that person is being honest in what she is saying and what she really feels deep inside.
Body language entails the gestures and movements involving the body, from head to foot. Each signal of body language may have different meanings, depending on the situation in which it was delivered.
You can signal yes or no by the movement of the head. Nodding usually means “yes” or “I agree”. But in other countries such as Yugoslavia and Turkey, it sometimes means “no”.
Tilting the head backwards or to the side indicates that the person is thinking deeply or considering a though or idea.
Face (Eyes, Nose, Lips)
Facial expressions are obvious visible signs of how someone truly feels, however there are some people who have practiced to take control of their facial expressions by making them somewhat expressionless or passive.
Even with an inexpressive face, nobody could miss what is being expressed through the eyes. The eyes can speak volumes given any circumstance. Eye contact is a strong indication of focus of attention, interest, attraction, and honesty. You can spot somebody lying to you if he or she cannot hold an eye contact for a period of time. When the eyes would look away, it signifies lack of interest, dishonesty, and boredom. But there are times when looking away signifies attraction or simply an occurrence of a slight distraction, for as long as the person will look back to the person he is talking to.