Fault tolerance refers to a system's capability to isolate, compensate for and recover from failure with minimal impact to the end user.

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There are several mechanisms built into Microsoft Azure to ensure services and applications remain available in the event of a failure. Such failures can include hardware failures, such as hard-disk crashes, or temporary availability issues of dependent services, such as storage or networking services. Azure and its software-controlled infrastructure are written in a way to anticipate and manage such failures.