USB Host

A device that can serve as a “master” USB device, to which other “client” peripherals can be attached, is referred to as a “USB host.” Computers are USB hosts by default. Some other devices can also serve as USB hosts or can be switched to a “USB host mode” that allows them to serve as a connection point for peripherals. An example is a tablet, which can be connected to a computer for transferring data, backup, etc., but that also can serve as a USB host to client peripherals.