Exascale computing refers to computer systems capable of performing at least one exaflop, or a billion billion (one quintillion) calculations per second. This massive processing power enables breakthroughs in scientific research, artificial intelligence, climate modeling, and cybersecurity by handling complex simulations and vast data sets. Exascale computers represent a major leap forward from previous supercomputers, allowing for unprecedented speed and accuracy in solving some of the world's most challenging problems.