Redundancy (engineering)

Redundancy in engineering is when a system or a machine has some extra parts or features that make it harder to fail. An example would be having two engines in an airplane instead of one. That way, if one engine fails, the other one can pick up the slack and keep the plane flying. Redundancy can also be extra backups or backups of backups! That way if something happens to the original, you have a few other copies to go back to. Overall, redundancy helps to keep things running properly and safely, even if something goes wrong.