What are themes in Jira?

Related questions

1. Is Jira better than trello?
2. What is a Kanban board in Jira?
3. What is Jira project key?
4. What is gravatar email?
5. What is epic theme?
6. How do I change my profile picture in Lotus Notes?
7. What does Jira stand for?
8. Can we change the project key in Jira?
9. What is Jira project category?
10. What is Kanban Jira?

Tags

1. #resources
2. #themes
3. #stories
4. #multiple
5. #theme
6. #another
7. #spending
8. #allow
9. #focused
10. #assigned
11. #story
12. #resource
13. #within
14. #implicitly
15. #relative
16. #versus
17. #allocation
18. #compare