What does API usage mean?

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Tags

1. #calls
2. #structures
3. #classes
4. #interface
5. #tools
6. #communication
7. #building
8. #specifications
9. #software
10. #object
11. #subroutine
12. #application
13. #programming
14. #forms
15. #includes
16. #remote
17. #definitions
18. #variables
19. #specification
20. #routines
21. #often
22. #computer
23. #protocols