Clapping or Applause is the most common human body noise that others are meant to hear that doesn’t involve the vocal chords. It is a collective social gesture that we use in groups, usually done an act of acknowledgement of something that has been performed well. We show approval by applause, the question is why do we do this? It has been suggested, by psychologists, that ‘clapping’ arises as a human behaviour from infancy, babies reach out to touch objects but in failing to do so, engage in the next best option, smacking their hands together. An alternative theory, proposed by Desmond Morris in his book 'People Watching, a guide to body-language', is that applause is a symbolic ‘Pat on the back’ for the performer, with one hand representing the others persons back whilst the other does the patting.