Drupal

Drupal is a "content management system (CMS)"

Drupal is GNU open source project. The standard release of Drupal is called Drupal core.

Drupal Core
Drupal core include capabilities to create and manage
content
file uploads/downloads
menus
user accounts
roles and permissions
taxonomy
blogs
discussion forums
online polls

Contributed Modules

Drupal Themes

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Chapter 2: Creating and Managing Content