Cache is temporary storage of an entire webpage or some data on a webpage that is, or should be, faster to retrieve than the way the webpage in question would normally get the data.
For example, if a particular webpage gets data from a database and displays it to the user, it might temporarily save the page (or just the database data) in a file on the server and display that to the user instead.
You would set a time limit for the cache so that the info will be updated at some point.
Joomla can cache pages, modules and views.
See Joomla Caching for how-to.








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