WordPress is an open source content management system running on PHP and MySQL often used as a blog engine.
Fundamentally, the WordPress Theme system is a way to “skin” your weblog. Yet, it is more than just a “skin.” Skinning your site implies that only the design is changed. WordPress Themes can provide much more control over the look and presentation of the material on your website.
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NOTE: The content of this tag was originally posted at StackOverflow.com