Alfa card not working

Running nethunter on my nexus 7 I connected my Alfa card directly to it via a mini USB cable so its going from the nexus's mini USB port to the Alfa cards port and can't get it to turn on. Do I need to use some type of adapter? Like a mini USB cable to regular USB then plug in the original cord that came with the Alfa card into that?

You need a USB OTG cable.

What exactly is a USB OTG cable?

Never mind sorry a quick goolge search lead me to the answer thank you off to best buy I go lol