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Add-ons are used to supplement or enhance computer software or hardware.

Drupal, Joomla and Wordpress are very popular and powerful content management systems. They are all written in PHP, support the MySQL DBMS and are built on a modular architecture that allows for extending them with additional functionality.

There are hundreds of free add-ons (modules, components, plugins) available for each of these three systems. Some of them are especially useful when it comes to optimizing your website for search engines.

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