Non Verbal communication is Basically sending and receiving messages in a variety of ways without the use of words.  It is both intentional and unintentional.  Most speakers and listeners are not conscious of this.

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According to Peter Bell "Nonverbal communication includes many features - touch and  smell, clothing, masks, vocal features and body movement.  The  nonverbal and verbal are both parts of communication. Indeed, nonverbal communication may take place in conjunction with our speech or even against our own intentions.  nonverbal communication can be unintentional, unconscious and unique in each individual

"Nonverbal cues have always been regarded as central to interpersonal relationships. Indeed people often define intimacy in terms of nonverbal behaviour. In one study, a participant wrote, a touch of the hand ... the meeting of our eyes, a kiss, conveyed our intimacy better than a thousand words". they also provide exterior signals. 

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Our body language is closely related with our speech, hand gestures can be an example of it. Have you ever notice that some time you are trying to say something but words are not enouhg? that's when the hands do the talking for us, and some time gestures are easier to comprehend.

Innocence, anger, wonder, shock, grief, terror, indiffer­ence, seriousness, friendliness, approval, disapproval, exasperation, and many other feelings can be expressed through the body language.

It is said that the face is the index of the mind. The thoughts of the mind, and the feelings of the heart often find expression on the face.

According to PK Singla "Physical presence and appearance of persons play a role in the process of communi­cation. The way the man or woman looks indicates the importance he or she attaches to his or her presence and participation. A disheveled look as evidenced by disor­dered hair, untidy, unruffled or unkempt appearance, suggests indifference or casual­ness."

Non verbal signals varies from one culture to another and the same signal can also have a different meaning, for example:

• touch: some cultures are more reserved about touch, it is closely related with respect. Colombians for example tend to touch everything and be very afectuous even with people they just met.
• eye contact: In some cultures looking into the eye can mean respect and that the receptor is paying attention. however in some cultures it can be a disrespectful behavior.
• volume: For some cultures being loud is offensive, for others a low volume can be interpreted as lazyness or lack of interest.
• proximity: Some cultures appreciate personal space more than others. proximity can be related with closeness.
• gestures: Some gestures have a uneversal meaning, however, you can offend a person from another culture without noticing.