Cache Invalidation in System Design

Cache invalidation is the process of removing or updating outdated cached data to maintain data consistency. It's crucial when the original data changes, preventing issues like stale or incorrect information. Cache invalidation methods, such as time-based, key-based, and write-through, help ensure cached data stays accurate. Incorrect cache management can lead to performance problems and unreliable results. 

Learn more about Cache Invalidation Methods here.