Is API testing functional testing?

Related questions

1. What is UAT process?
2. What is alpha test and beta test?
3. Is smoke testing functional testing?
4. What is UAT testing in SAP?
5. Why is UAT testing important?
6. What is difference between alpha testing and beta testing?
7. What is the purpose of UAT testing?
8. What is bat testing?
9. What is acceptance testing with example?
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Tags

1. #directly
2. #performed
3. #interfaces
4. #since
5. #layer
6. #message
7. #performance
8. #reliability
9. #programming
10. #security
11. #involves
12. #software
13. #integration
14. #determine
15. #testing
16. #functionality
17. #application
18. #expectations