Hi Nana, welcome to the forum and congratulations on your new tablet. Nice to have you here as a new member of Android Tablets. As TheDroid13 pointed out, the USB cable would be used to transfer pictures , movies and other things from your computer to the tablet or from the tablet to the computer. Sometimes, depending on the tablet, it might also be used to charge the tablet battery. In that case, the other end of the cable would plug into your charger like it does on my Nook Color. Enjoy yourself on the forum. If you have any questions or need help with the new table, just click this link and ask away! http://www.androidtablets.net/forum/craig-tablets/