A module in drupal is a folder of files containing some functionality and is written in PHP. The folder name is the name of the module. There are 3 kinds of modules, they are core modules, community modules and custom modules.
Core modules come with the drupal installation and lives in
drupalRootDir/modules/. They provide the core functionalities and they are not supposed to be modified unless it’s an official update from Drupal.
Community modules live in
drupalRootDir/sites/all/modules/. They are written by the Drupal community and shared under the same GNU Public License (GPL) as Drupal.
Custom modules also live in
drupalRootDir/sites/all/modules/. They are written by the site developers, highly customized functionalities for the particular site.
Installing a drupal community module.
1. Download the module from drupal.org, usually in zip or tar format.
2. Unpack the files from the zip for tar file into
3. Go to the drupal admin dashboard and select modules from the top menu bar.
4. Find the module you downloaded, check the enable checkbox and save the configuration.
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