Directional Sound (What is ?)

Yesterday, I got to watch 'BOYS TOYS' show on the History Channel. The programme talked several topics and was majorly focused on the the arms and ammunitions. Something that I had not known , and was told there was the Directional Sound.

• What is the Directional Sound?
  The term Directional here means , something that is focused in a particular direction. This very concept is best implemented in the LASER beam technology, which focuses a red (generally) beam at a point.
  
  The concept of Directional beam of light has now been implemented in the acoustic systems, which has lead to invention of Directional Sound.
  
  
• History !
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• To be continued ...