If you have a system with a single component, then the system has the same reliability as that component. If the component fails, the system fails as well.
If you create a system with multiple redundant components, then the failure of a single component no longer means the entire system fails. As long as there is a single component that didn’t fail, the system remains functional.
As no component is 100% reliable, using redundant components improves the overal reliability.
An example could be providing electricity to you:
If there is a single cable providing electricity from the powerplant to you, you will lose power if that cable is broken due to roadworks.
If there are 2 redundant cables providing electricity to you. A break in one cable would still mean your are getting electricity from the other cable that didn’t break.
(*Redundancy* in cabling means in this case a cable that takes a different route.)
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