Supercomputers are highly powerful computers that can perform massive calculations rapidly. They consist of tens of thousands of processors capable of billions or trillions of calculations per second. Supercomputers are used for data mining, predicting climate change, intelligence work, and nuclear weapon testing. They generate huge amounts of heat and data and consume large amounts of electricity. The fastest supercomputer is Summit, with 200 petaflops of power. In India, the Aaditya supercomputer ranks among the top 500 and is used for climate research, while Param Yuva II performs at 524 teraflops and will be used for various research areas. Supercomputers have numerous benefits and uses, and will likely continue advancing in the future.