What's the img difference between uefi-memstick or memstick?

I am quite new to FreeBSD. I am thinking to learn FreeBSD via installing it on intel NUC Intel D34010WYK.

What's the difference between FreeBSD-10.1-RELEASE-amd64-memstick.img and FreeBSD-10.1-RELEASE-amd64-uefi-memstick? which one I should select for Intel NUC D34010WYK?

I saw some files on FTP release section ends with xz. What is it for?

Thanks.
 
The plain version is for standard BIOS computers. The UEFI version is for computers with a UEFI system. The boot screen might indicate which is used on the NUC.

Files with a .xz extension have been compressed with the xz(1) compression utility. They must be uncompressed before use.
 
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