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According to Wikipedia, a content delivery network or content distribution network (CDN) is a system of computers containing copies of data, placed at various points in a network so as to maximize bandwidth for access to the data from clients throughout the network. A client accesses a copy of the data near to the client, as opposed to all clients accessing the same central server, so as to avoid bottleneck near that server.
Content types include web objects, download-able objects (media files, software, documents), applications, real time media streams, and other components of internet delivery (DNS, routes, and database queries).
There are currently three main CDN extensions available for Joomla, and I've just installed one on this site. I'm happy with the result - I hope you notice the difference in speed! In this post, I'll look at what CDN is, take a look at two different CDN extensions for Joomla and how to set up CDN using jomCDN from corephp.