What is UEFI built in EFI shell?

Related questions

1. What is UEFI in Linux?
2. What is an EFI shell?
3. How do I use EFI shell?
4. Which is better UEFI or Legacy BIOS?
5. Do I have UEFI or Legacy BIOS?
6. Should I use UEFI or BIOS?
7. How do I get to the EFI shell?
8. What is ASUS EZ Mode?
9. What is EFI Shell from filesystem device?
10. What is the advantage of UEFI?

Tags

1. #outside
2. #shell
3. #environment
4. #built
5. #interface
6. #small
7. #effectively
8. #provides
9. #firmware
10. #modern
11. #maintenance
12. #operating
13. #extensible
14. #motherboard
15. #troubleshooting
16. #system
17. #servers