Glossary term
What is Redundancy? Meaning for developers
Having spares of critical parts. Example: Two load balancers, three app servers.
Learn it properly · System DesignLesson 40: Single Points of Failure, Redundancy & FailoverThe site went down, and the culprit was none of the redundant boxes on the diagram but the one NAT gateway, the one DNS provider, or an expired certificate. How to hunt single points of failure, shrink blast radius, add redundancy that works, and fail over without split brain.