This is meant to be a canonical Q&A for all the caching questions we get on meta
- What is caching?
- Where is caching employed across the network?
- Approximately how long ought it take for each cache to update?
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Caching is the storing of dynamic data in static form for reasonable periods of time. This reduces the number of queries required to display a page. The Stack Exchange engine caches heavily in places, to minimize cross-site queries. It uses Redis to help facilitate this. There is more on how exactly SO caches here.