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Cache Invalidation is also called cache-busting andpurging cache. Cache invalidation is done so that the latest resources are fetched and shown to the user. CDN cache is a component that saves data so that future requests for that data can be served faster. Database Caching is an intermediary player between client and server. Browser Cache Caching helps for faster response time but also reduces the load on your server.Cache Invalidation can be used to invalidate the cache and purge the cache.