The original intention of the JIRA creators was to use it as a bug tracking tool. Currently, it is one of the largest and most complex systems for managing programming projects and more. It allows you to manage requirements and test cases, has extremely extensive reporting capabilities, and is also adapted to the work of teams working in the Agile methodology (supports both Kanban and Scrum). It also has many free and commercial extensions that can be used depending on the needs of a given team or company. It integrates perfectly with other Atlassian tools.