What is a Google Doc add on?

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Tags

1. #based
2. #platform
3. #quickly
4. #customized
5. #built
6. #sheets
7. #business
8. #easily
9. #suite
10. #application
11. #using
12. #create
13. #development
14. #rapid
15. #extensions
16. #applications
17. #gmail
18. #script
19. #javascript
20. #productivity
21. #google