If you’ve ever had your computer crash, causing you to lose your work, you have experienced an issue that could have been solved with redundancy. Redundancy is the duplication of essential hardware or functions so as to increase reliability. Redundancy is why single-jet engines are never permitted as commercial passenger planes—additional engine(s) must be present in case one fails. This practice ensures that the failure of one component does not result in a failure of the whole machine.
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