Fundamentally, the WordPress Theme system is a way to "skin" your website or blog. Yet, it is so much 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.
A WordPress Theme is a collection of files that work together to produce a graphical interface with an underlying unifying design for a weblog. These files are called template files. A Theme modifies the way the site is displayed, without modifying the underlying software. Themes may include customized template files, image files (*.jpg, *.gif), style sheets (*.css), custom pages as well as any necessary code files (*.php).
Most WordPress themes provide:
Just like WordPress plugins, you can choose from over a thousand free themes from the WordPress Theme Directory or invest in premium, paid themes.
The advantages of premium themes are like those of premium plugins. Premium themes usually have a reliable code base and offer support if something goes wrong.
Some premium themes, like Builder, operate more like web design software, allowing you to design and build your own theme designs and page layouts.
If you would like to know how to change or add a theme to WordPress, view our simple step-by-step guide here.