Now Windows 8 supports the UEFI bootloader and I have read that its different from the BIOS, but it's unclear to me after many searches on the Google. Some points in mind are below :

As we all know, BIOS is an important part of accessing boot options. So now UEFI will do that? How?

How would I know that I'm booting with UEFI not with BIOS?

So what is the real different in the "boot with BIOS" and "boot with UEFI"?