Chapter 1. Overview of Drupal
What Is Drupal?
Depending on who you talk to, you’ll hear Drupal called a Content Management System (CMS) or a Content Management Framework (CMF, a platform that you can use to build a custom CMS)--and both are accurate. It can be called a basic CMS because after installing only the base Drupal software, you can create a website with forums, static pages, and/or a blog, and manage the content online. On the other hand, it can be called a flexible CMF because most people choose to add additional modules to Drupal in order to build more complicated websites with more features, and Drupal also allows you to create fully custom modules.
Drupal is free and open-source software (FOSS), governed by the GNU General Public License (GPL) version 2 (or, at your option, any later version). If you have never read the GPL and plan to use Drupal, you would be well advised to do so (even more so if you plan to do any Drupal programming, for yourself or others). The GPL governs not only what you can do with Drupal software itself, but also what you can do with any add-ons you download from drupal.org, code you find on drupal.org documentation pages, and any derivative work (work that contains GPL-licensed work, verbatim or with modifications) that you or others create. It’s also written in plain English and is quite a good read (for programmer-types anyway); you can find it in the LICENSE.txt file distributed with Drupal core, or at http://gnu.org.
And finally, Drupal ...
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