USB 2.0 and 3.0 expansion hubs are designed to add additional USB ports to a computer system. While mostly designed for compact systems like notebook and laptop computers, a USB hub can also be very useful for adding more accessible USB ports to a desktop PC. A USB hub typically connects to a single USB port and provides anywhere from 3 to 12 additional USB connections. Many USB hubs for sale even provide additional ports, such as HDMI, DVI, RJ-45 ports, and also slots for reading memory cards, so that transferring data from memory cards to a hard drive becomes a breeze. We recommend adding a laptop USB hub to your backpack as a great travel companion when traveling or working remotely.