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3.1.1 Invalidation overview
Invalidation ensures that users of your e-commerce Web site are not browsing stale or invalid content from your site as a result of caching items that have changed.
In many cases, the validity of a cache entry is governed by business requirements. For example, when a catalog is updated and a new product description or price is created, the cache entry that contains the old product information will be wrong. The entry is removed from the cache so it will not be served up to a user as part of an outdated product page. Another scenario is a marketing campaign. The cache entries will become invalid at the end of the campaign.
Invalid cache entries are also known as stale entries. They must be evicted from the cache. In most cases the invalid cache entry is regenerated and added as a new cache entry.
A correct and efficient invalidation strategy will allow your Web site to react appropriately to change and ensures your customers or business clients get the most accurate information possible and in a timely manner.