In today’s world, manufacturers are constantly trying to make computers smaller and more powerful. However, when computers were first invented, size was not a consideration at all. In fact the first fully functional digital computer called the ENIAC weighed almost 50,000 kilogrammes and took nearly 3 years to build. The ENIAC was very large but not very powerful when compared to computers today. By comparison, an average cell phone today is about a thousand times more powerful than the ENIAC was. Today, some super computers are still being built for processing power with no consideration of size. Examples of such super computers are the Sunway TaihuLight super computer in China and the Summit in America. The Summit weighs more than 300,000 kilogrammes. Super computers generate a lot of heat and need to have well designed cooling systems to avoid over heating. The Summit has a water based cooling system that pumps 4,000 gallons of water through it per minute. These super computers allow researchers to run very complicated algorithms on very large sets of data in a shorter amount of time with a high degree of accuracy. Super computers can be used for various purposes like breaking encryption codes, doing calculations in the field of astrophysics or even playing chess.