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The easiest way to wrap your head around how modules work is to try installing and configuring a couple of them. This section will cover how to install, enable, and configure two modules: Path, a module that’s built into Drupal core, and Administration Menu, which is a contributed module that may be downloaded from Drupal.org.
In the earlier hands-on section (Section 2.3”), we created an “About Us” page and a “Home” page and added them to our site’s menu. But if you return to those pages, you’ll see that the URL is something like http://www.example.com/node/1. Wouldn’t it be great if we could instead give these pages nice search engine–friendly URLs like http://www.example.com/about? We can, with Drupal core’s Path module.