Is BIOS RAID software or hardware?

Related questions

1. What is BIOS RAID mode?
2. What is a hardware RAID?
3. Which is better ext4 or NTFS?
4. Which is the best raid to use?
5. Which is better RAID 5 or RAID 6?
6. What is software RAID?
7. What do RAID cards do?
8. Is ZFS a RAID software?
9. How does RAID DP work?
10. Do I need a RAID card for unRAID?

Tags

1. #based
2. #hardware
3. #between
4. #implementation
5. #built
6. #computer
7. #purely
8. #software
9. #separate
10. #processor
11. #controller