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• Drupal has a vast community of developers who encourages continuous innovation and improvement.
• Drupal prioritizes user experience to build robust and customer driving websites. For this, Drupal uses Claro administrative theme, layout builder, and mobile responsive web features.
• Drupal provides a flexible and scalable API architecture and is faster and more optimized than any other CMS in terms of page loading and bandwidth.
• Security is the utmost priority when it comes to digital experience. Drupal provides the best security features and every new module goes under a strict review by the Drupal core maintainers team before it is publicly released. 

The core modules used in Drupal are - 

• Actions UI module.
• Aggregator module.
• Activity tracker module.
• Automated Cron module.
• Block module.
• Ban module.
• BigPipe module.
• Book module.

Twig is a template engine of PHP. Twig is a part of the Symfony2 framework and replaces the PHPTemplate as the default template engine. 

Hooks provides Drupal developers the facility to change and extend the Drupal core functionalities. Code components in modules communicate through hooks feature. A module developer can alter the way a core module looks without modifying the existing code.

Any object handled and managed by the service container is a service. Drupal 8 comes with the decouple reusable feature and registers services with a service container to make services pluggable and replaceable.

To run a call in Drupal 8, first you have to create a Controller and add controller class to it.

Create a service, add a service class, and a routing file.

Use services in a controller. 

A menu is a collection of custom links and categories which are used to navigate between web pages. Menus are shown as a hierarchical representation of links using Drupal's block functionality. The Menu modules has a robust interface that customizes and designs powerful menus for the website.

A data module provides Drupal developers an administration interface and low-level APIs for accessing tables' content and modifying the data in tables. The Data module provides -

• an API for insertion, updation, and deletion and describes how the tables are joined.
• Automatic integration of views.
• an API for automatic allocation of tables for one row of records.
• a way for exporting table definitions to code.

• Data - The input taken as data is the first layer because it contains the information to be stored on a page. It includes nodes, etc.
• Modules - The functional plugins which are included as core, contributed, and custom modules.
• Blocks and menus - Blocks are the core and extensible features provided by the Block module with an API. A block is used to represent a particular information in an area other than the main content, primary or secondary menus, and breadcrumbs. A menu is a collection of links which is used to navigate between different web-pages and sections of a website. The new menus are created inside the built-in menus by default. But the Drupal developers can design custom menus also.
• User permissions - Users are assigned to several roles and user permissions grant them the pre-defined permissions.
• Themes and templates - Theme is the top layer of Drupal architecture which is comprised primarily of XHTML and CSS with mixed PHP variables, to direct the way of content. Each theme in Drupal is included with a set of functions that can be used for overriding standard built-in functions in the module to give complete control of how a module generates its markup at the time of output. A theme can have one or more templates depending on the website design and its ability to handle complexity.