If there is no ethernet port on your machine this will enable to have the LAN port with the help of connecting to the USB port. I would rather say these kind of things are more intended to get the gigabit ethernet LAN port rather than the conventional LAN ports (which I believe exist in each and every machine/pc/laptop now a days). Instead of changing the existing LAN card you can just use this to get the gigabit LAN port easily using the USB 2.0 or 3.0 ports.