A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
for questions about Drupal's configuration system.
Use it for questions about path aliases, a way of creating pretty human readable URLs to replace system URLs like node/[nid].
Use it for the e-commerce module developed for Drupal: Ubercart.
Use it for questions about importing/exporting Drupal code, settings, or content from a site to another.
Use it for questions about updating Drupal core and contributed modules.
Use it for questions about the Organic Groups module, not the Group module.
Use it for questions about the installation of Drupal, modules, or themes.
Use it for questions related to the Token module, or a similar form of token replacement system. Don't use it for authentication tokens.
The Services module provides a standardized solution for integrating external applications with Drupal.
Use it for questions about the PHP application library dependency manager (Composer).
Use it for questions about module and theme debugging (e.g. "How do I debug this situation?").
Use it for questions about Drupal's performance, how to measure, and improve it.
Use it for questions about configuring Drupal as multi-site, and/or using Drupal's multi-site feature.
Use it for the module implementing a flexible flagging system, completely customizable by the administrator users: the Flag module.
Use it for questions relating to the Paragraphs module, not for text or body paragraphs.
Use it for questions about performing routine and other maintenance tasks in Drupal.
Use it for questions about the module used by site developers to export elements of a site configuration to use them in another site.
Use it for questions about automated Drupal tests.
Use it for questions related to site security, in particular those focused on protecting a Drupal site from unauthorized access.
The process of splitting the result of a query on different pages is called, in Drupal terminology, paging.
Use it for the user authentication/authorization on Drupal core or third-party modules.
The module contains a set of APIs and tools to improve the developer experience.
Drupal handles text using filters and input formats.
Real-world geographic locations can be associated with Drupal entities.
The "Display Suite" module allows to take full control over how the content is displayed, using a drag and drop interface.
Version tags should be used for questions that apply to a version only, not to merely say what version a site is using.
Use it for questions about the configuration file used from the Apache server, the .htaccess file.
Use it for questions about integrating Drupal with the services provided by a social network like Facebook or LinkedIn.
Use it for questions about rating modules.
The tags placed in the <head> element to provide meta information about the document are called meta-tags.
Use it for the management of changes to documents and other information stored as computer files.
In Drupal, it shows the hierarchy of the page currently viewed.
Use it for the web mapping service application and technology provided by Google.
Use it for questions about moving from a major release of Drupal to the next.
Use it for questions about the session system, which handles recognizing users from a session cookie.
Use it for Drupal 8 plugins; for plugins implemented from the Views module use views, ctools for Chaos tool suite plugins.