It's a normal part of everyday human interaction. A very important part of this is the nonverbal cues that are expressed. According to Jan Hargrave, an informational speaker on body language, fifty-five percent of communication is of the nonverbal variety. Understandably, mastery and understanding of nonverbal cues and body movement can be very advantageous.
Words work to a point, but nonverbal communication can convey deeper meaning.
Nonverbal communication is particularly useful in some everyday situations. It is immediate, useful in making initial judgements when verbal questioning would be inappropriate, and it gives information about one's relationship to others. It is also the primary tool for conveying emotion. It is important to note here that a gesture is movement meant to add meaning. Meaningless movements are not gestures, but distractions.