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WordPress as a CMS
WordPress as a Content Management System
WordPress is a blog publishing system, or content management system, written in PHP and backed by a MySQL database.
It is distributed under the GNU General Public License.
WordPress, straight out of the box, comes ready to embrace search engines.
Its features and functions guide a search engine through the posts, pages, and categories to help the search engine crawl your site and gather the information it needs to include your site within its database.
WordPress comes with several built in search optimization tools, including the ability to use .htaccess to create apparently static URLs called permalinks, blogrolling, and pinging.
There are also a number of third party plugins which can be used for search engine optimization (SEO).