Already said that they are just about of normal computers running together. But why they are fast ?
Imagine you need to calculate 2*3*4*5. You surely can do it like that: 2*3=6, 6*4=24, 24*5=120.
Or if you have two computers you can calculate 2*3=6 on one of them, at while first one you s busy you can do 4*5=20 on the other one. And then combine those into 6*20=120.
Supercomputers do exactly that, but with way harder tasks on way larger scale. For example – you got a bunch of data you want to turn into an image. Perhaps you can calculate 1 pixel of this image per second.
Instead of making one computer do 1 million pixels one by one you can make a million computers draw one pixel each.
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