These cards are called 2.2 or 2.3 slot cards and you can know more about them below. Make sure there aren't any lines of credit listed that you don't know about. Also, make sure any Web site you use for purchases is secure -- most Web browsers have an icon that lets you know whether or not a site uses encryption to keep your information safe. If you have a wireless home network, use a secure encryption method, such as WPA2.