Cluster (computing)

set of computers configured in a distributed computing system
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In computing, a cluster is made of many individual computers that work together to solve a problem at hand. Clusters can have different forms: They can be whole computers working together, or only CPUs. These CPUs can communicate over a fast network, but they share the same hard disks, for example. Depending on the problem, solving it with a cluster of cheaper components can be less expensive that investing in better hardware that costs more.

A cluster of computers at NASA

Grid computing is different in that the individual computers work on separate tasks that are part of a large problem. They are usually more different from one another and geographically further apart than cluster computers are.