Supercomputing is like having a really big and powerful computer that can do lots of things at the same time. Japan has a supercomputer called Fugaku and it's one of the fastest and most advanced in the world.
Fugaku is kind of like a big puzzle where lots of different parts work together to do lots of complicated calculations really fast. It has lots of special chips called processors that help Fugaku work really fast.
People use Fugaku for all sorts of things, like predicting weather, designing new cars and airplanes, and even finding treatments for diseases. Fugaku is important because it helps people find answers to big problems faster and more accurately than regular computers can.
Japan is really proud of Fugaku and what it can do, so they're always working on ways to make it even better. They want to keep using technology to help people solve big problems and make the world a better place.