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Caching
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=======
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Caching is a cheap and effective way to improve the performance of a Web application. By storing relatively
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static data in cache and serving it from cache when requested, the application saves the time that would be
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required to generate the data from scratch every time.
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Caching can occur at different levels and places in a Web application. On the server side, at the lower level,
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cache may be used to store basic data, such as a list of most recent article information fetched from database;
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and at the higher level, cache may be used to store fragments or whole of Web pages, such as the rendering result
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of the most recent articles. On the client side, HTTP caching may be used to keep most recently visited page content in
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the browser cache.
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Yii supports all these caching mechanisms:
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* [Data caching](caching-data.md)
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* [Fragment caching](caching-fragment.md)
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* [Page caching](caching-page.md)
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* [HTTP caching](caching-http.md)
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