An Issue is a problem or bug that is reported in the Drupal CMS. It is typically reported by a user or developer in the Drupal issue queue, which is a public forum for tracking and discussing bugs and feature requests. Issues can range from minor bugs to major security vulnerabilities. Issues are typically assigned to a specific Drupal core maintainer or module maintainer for resolution. Issues can also be assigned to other members of the Drupal community for review and discussion.

When an issue is reported, it is assigned a unique issue number and is given a status. The status of an issue can range from "Open" to "Closed" or "Fixed". Issues can also be marked as "Needs review" or "Needs work". Issues can also be assigned a priority, which indicates the urgency of the issue. Issues can also be marked as "Critical" or "Major" depending on the severity of the issue.

The Drupal issue queue is an important part of the Drupal development process. It allows developers to track and discuss issues, and it allows users to report problems and request features. The issue queue is also a great way for developers to collaborate and work together to resolve issues.