system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What's the difference between UEFI and BIOS?
gpt
UEFI is the replacement specification for BIOS - it does the same basic role of bootstrapping on launch, but BIOS has a host of technical limitations owing to the fact that the original specification is nearly 30 years old and unable to work with some modern hardware (for example, BIOS can't work with a hard disk of over 2.1TB).

An easy illustration - any newly built computer that boots into UEFI will have usb mouse support. No such luck on an old AwardBIOS.