Some models have an internal header for USB. With the right cable, you can run a USB connection from it. It's useful if you're putting a NUC board in a different case.
OK, thank so much for the answer. Does that mean that I can connect a USB 2.0 specified cable directly to the NUC, i.e. kit NUC6I3SYH without problems? Probably I will run Win10 OS.
I'm not sure we're talking about the same thing. The NUC has multiple USB ports for connecting USB cables/devices. Your model supports USB 3.0 and is backward compatible for USB 2. The internal header requires a cable with a USB female connector on one end and a specific connector on the other end for the header. The specs for your NUC should list the specific type of connector the header uses (there are several). From that point you can buy a cable from anywhere that sells them (cablestogo.com is one, I believe).
Again, thanks a lot for the answer. To be more exact: I plan to use the new NUC to connect to a high end Digital Analog Converter with a high end USB cable and use the NUC as my main machine for music playback. I need to install a specific USB driver on the Win10 OS that support high speed USB 2.0. From your answer I understand that this will work. The USB cable has normal A/B connectors.
NUC’s USB ports are backward compatible with USB 2.0. Now, as you stated before your device will work properly if there are Windows® 10 drivers.
Some NUC boards have an additional USB 2.0 port next to the fan.