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