What is the difference between pull request and merge request?

Related questions

1. What is a git conflict?
2. What is the purpose of a pull request?
3. What is the difference between Git and GitLab?
4. Can you delete a pull request?
5. How do I pull git from GitHub?
6. What is bitbucket pull request?
7. How do you push to a pull request?
8. Is a pull request part of Git?
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Tags

1. #means
2. #another
3. #broader
4. #requests
5. #refers
6. #these
7. #request
8. #topic
9. #commands
10. #merge
11. #changes
12. #pulling
13. #behind
14. #scenes
15. #branch
16. #merging
17. #existing