Cache Invalidation
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The process of removing or marking cached data as stale when the underlying content changes. Cache invalidation is notoriously difficult ('There are only two hard things in computer science: cache invalidation and naming things'). Strategies include time-based expiration (max-age), version-based URLs (file.v2.js), purge APIs (CDN-specific), and tag-based invalidation. Improper invalidation leads to stale content being served to users.