NTLDR

Just know that it's going to have that other partition, and if you delete that partition, you will not be able to boot.

In the past, in Windows XP and way, way long ago, it was called NTLDR and it was a completely different bootloader compared to this.

This bootloader came out in Vista and kind of revamped it and made UEFI possible for Windows.

It is real hacky and I don't particularly like the bootloader.