ELI5: Explain Like I'm 5

PlayStation 3 cluster

A PlayStation 3 Cluster is a group of two or more PlayStation 3s linked together. When linked together, they can be used by multiple people at once. This allow people to play certain games together that might only work on certain systems, and also to do computations or calculations faster than with one system. It's like having a supercomputer made of PlayStation 3s!