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.

Learn it from:

• http://net.tutsplus.com/tutorials/wordpress/how-to-create-a-wordpress-theme-from-scratch/
• http://wptheming.com/

NOTE: The content of this tag was originally posted at StackOverflow.com