• The fastest 
  •  Very expensive & specialized for mathematical calculations.
  •  Eg: weather forecasting 
  •  Uses: animated graphics, nuclear energy research and petroleum exploration.

 Characteristics

  •    Powerful & Expensive
  •    Dedicated to one purpose - weather, satellites, military 
  •    Used by large governments or very large companies
  •    Can be used by thousands of people at the same time
  •    Very large - fill rooms

One of the super computers IBM's Blue Gene/L with sixteen racks performs 70.7 trillion calculations per second

As per wikipedia, The Sunway TaihuLight (Chinese: 神威·太湖之光, Shénwēi·tàihú zhī guāng) is a Chinese supercomputer which, as of November 2017, is the fastest supercomputer in the world,