Extend | drupal 8 extend module #4 | How to install module in drupal 8| Enhance features in drupal 8

In this Drupal 8 videos, we show you the Extend tab.
Click on this tab and you'll get an overview of all the features on your Drupal site. Modules can simply be described as features
Modules are bundles of primarily PHP code that extend Drupal in order to add new features or alter existing functionality. Modules can be installed to enable their features, and uninstalled to turn the features off. This flexibility allows Drupal users to tailor each instance of Drupal to their specific use-case, and to use only the features of Drupal that they need. There are thousands of community-contributed modules available. A large part of learning Drupal involves learning how to locate, install, and evaluate existing modules in order to determine if the functionality they provide is what you need.
Developers can write PHP, HTML, CSS and JavaScript to create new modules when necessary. A module can provide generic functionality (for example, integrating with Twitter) with the intent of contributing it back to the community. A project-specific module can either alter existing features or contain new custom features in order to solve specific project requirements.
There are three main types of modules:
core modules: modules that are included with Drupal core and live in the /core/modules directory
contributed modules: modules downloaded from Drupal.org that are not part of Drupal core, and are typically placed in the /modules/contrib directory
custom modules: project-specific modules that you or another developer wrote specifically for your application, and are typically placed in the /modules/custom directory
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[@subratabiswas943]

Install new module is not showing in my extend > List tab. Can you please give a solution.

[@pradipmehta10]

Where have you placed your module, Please check carefully. It should be inside modules->contrib. (not in core->modules)