What is UEFI and legacy boot mode?

Related questions

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

Tags

1. #record
2. #extensible
3. #partitioning
4. #specifying
5. #unified
6. #formats
7. #information
8. #table
9. #firmware
10. #master
11. #legacy
12. #successor
13. #whereas
14. #physical
15. #interface
16. #partition
17. #scheme
18. #refers