Drupal is one of the most popular open source CMS (content management systems) that gives you the capability to build all types of websites. You can build almost any type of website using this CMS, from a simple blog to a full-blown ecommerce store.
An open source product such as Drupal allows a large community of users to build products that help other users expand on how they use the CMS. When a user creates a modification that is available to everyone, it is called a Drupal module. Some examples of modules that are in the marketplace includes one to help with the installation of Google Analytics or adding spam preventions for contact forms. Modules are a huge part of why people use the Drupal CMS, since it enables a basic user to turn their site into a creative masterpiece.
Another key component of Drupal is the availability of Drupal themes. Again, themes allow a normal person to create an attractive blog that is easy to manipulate to make it their own. While Drupal comes with a basic set of themes to use, most people want to make their site somewhat original. The open source environment allows developers to create lots of themes for users to use on their site, making it an attractive option for any website owner. For instance, this site use the Bamboo theme.
Finally, Drupal is one of the most advanced free CMS that are available, as they offer an amazing admin area so that you can control all aspects of your site. Any beginner can go in and start building a custom site, while advanced users appreciate the many options that other CMS don't provide. One example is advanced URL control, which enables users to define what type of structure they want certain content to use.