How does a PXE boot work?

Related questions

1. What is the difference between UEFI and Legacy boot mode?
2. Does resetting BIOS delete files?
3. What is USB legacy emulation?
4. What is ohci?
5. What is USB Universal Host Controller?
6. Does PXE use bootp?
7. Is PXE boot secure?
8. What happens if I reset BIOS to default?
9. What is the use of PXE boot?
10. What is BIOS mode on keyboard?

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6. #suggested
7. #traditionally
8. #slightly
9. #states
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11. #server
12. #changed
13. #pressing
14. #client
15. #sends
16. #picks
17. #process