What is meaning of XD in chat?

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Tags

1. #person
2. #emoticon
3. #squinted
4. #really
5. #denotes
6. #laugh
7. #sends
8. #laughing
9. #laughter
10. #appear
11. #letter
12. #usage
13. #while
14. #acronym
15. #phrase
16. #mouth
17. #expression