Drupal Terminology
Nodes: Content in Drupal is created in individual 'nodes'. Almost all content in Drupal is stored as a node. When people refer to "a node" all they mean is a piece of content within Drupal.
Blocks are boxes of content that may be placed in various content areas on your site. They are usually generated automatically by modules, but administrators can create blocks manually.
Menus are a collection of links (menu items) used to navigate a website. The list(s) below the menu title display the currently available menus along with their menu items. Select an operation next to the item to manage each menu or menu item.
Users are all of the accounts registered on your site.
Roles allow you to fine tune the security and administration of Drupal. A role defines a group of users that have certain privileges as specified in Access Control. By default, Drupal comes with two user roles: Anonymous user: this role is used for users that don't have a user account or that are not authenticated. Authenticated user: this role is automatically granted to all logged in users.
Modules are plugins for Drupal that extend its core functionality. You can select which modules are enabled. Once a module is enabled, new permissions might be made available.
Core modules refer to the modules that are included with Drupal core.
Contrib or Contributed modules refer to modules contributed to the Drupal community to extend and enhance your Drupal site. Contributed modules are not part of the official release.
Taxonomy or Categories allow you to classify content into categories and subcategories; it allows multiple lists of categories for classification (controlled vocabularies)
