Drupal is a free and open source content management system (CMS) written in PHP and distributed under the GNU License. It is used as a backend system for at least one percent of all websites worldwide ranging from personal to large corporate sites. It is also used for knowledge management and business communication..
Drupal contains basic features common to most CMSs:
User account registration and maintenance
Menu management
RSS-feeds
Page layout customization
System administration.
Although Drupal offers a sophisticated programming interface for developers, no programming skills are required for basic website installation and administration.
Drupal core
Drupal core stands for the basic CMS package. It can be extended through various add-ons and plugins that are downloadable on the main Drupal website or on other third-party pages. Drupal core incorporates keyword system for easier access to content and modules.
Core modules
There are some modules included with the core package that you can enable additionally to further extend the functionality like for example:
Access statistics and logging
Advanced search
Blogs, books, comments, forums, and polls
Descriptive URLs
Multiple-level menu system
Multiple-site support
OpenID support
RSS Feed and Feed Aggregator
Security/new release update notification
User profiles
Various access control restrictions
There are some templates included in the core package as well that can help you achieve the modernistic vision of your website.
Extending Drupal core
Thanks to the great functionality of this content management system you are able to extend its features to whole new levels using third party templates and “droplets” or otherwise said – plug-ins. Drupal is great for anyone looking for speed, flexibility and data integrity as well as design capabilities.