Why is kernel upgrade needed in Linux?

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5. What is difference between OS and kernel?
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7. How does a kernel work?
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Tags

1. #cannot
2. #upgrade
3. #system
4. #required
5. #current
6. #active
7. #additional
8. #interface
9. #between
10. #provide
11. #kernel
12. #linux
13. #require
14. #update
15. #updating
16. #sometime
17. #operating
18. #reasons
19. #after
20. #become
21. #hardware
22. #functionality