Cheap USB Hubs

The USB hub is a hardware device used for expanding USB ports. Most USB hubs have 1 upstream port that connects the hub to a computer (or another hub) and 4 downstream ports for connecting other USB devices to the hub.
USB hubs come in different shapes and designs and can be bus-powered (get the electrical power from the USB interface is connected to) or self-powered (have an external source of electrical power).