LAN Drivers - What are UEFI UNDI Driver & Dash In-Band Config for Windows?

[BrianS6]

I found newer LAN drivers at RealTek & I knew what most of them were but there are two that I don't know & I haven't found an explanation online.

The RealTek page is:
Realtek PCIe FE / GBE / 2.5G / Gaming Ethernet Family Controller Software
https://www.realtek.com/en/componen...0-1000m-gigabit-ethernet-pci-express-software

Can someone please explain what these are?

UEFI UNDI Driver (X64/ARM)

Dash In-Band Config for Windows

Thanks,
Brian.