Single point of failure

A single point of failure (SPOF) is a part of a system that would stop the entire system from working if it were to fail. The term single point of failure implies that there is no backup or redundant option that would enable the system to continue to function without it. SPOFs are undesirable in any system with a goal of high availability or reliability, be it a business practice, software application, or other industrial system. If there is a SPOF present in a system, it produces a potential interruption to the system that is substantially more disruptive than an error would be elsewhere in the system.

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