Thus far no ELI5….
Humans did math with pen and paper or whatever until calculators were created. Which does basic math for us quickly.
A computer is basically a calculator created to do MORE math faster. A regular calculator can do 1 “math” at a time.
A 5ghz CPU in a desktop computer can do ~5 billion of “Maths” per second.
So a super computer is basically a bunch of regular computers working together.
So if a super computer has the equivalent 1,000 of Desktop computers working together it 1,000*5billion = 5 trillion “Maths” per second.
Being able to do the same math as 5 trillion calculators in 1 second allow us to analyze incredibly large amounts of data faster. Data analysis is the core of prediction of things. Such as weather.
TLDR: A bunch of computers connected to each other can do Math faster than 1 computer alone.
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