Drupal is a free software package that allows you to easily organize, manage and publish your content, with an endless variety of customization. Drupal can be used to build everything from personal blogs to enterprise applications.
If you are looking for developing a user friendly yet cost effective website for your business vertical then drupal is really good choice for you. Drupal has become one of the most used open source development framework with PHP as its base. You can create almost any website by using its full functional features and its robustness.