What Can You Plug Into A USB Port? You may plug cables into a USB port at any time regardless of whether the devices involved are powered on or off....
Many types of consumer electronics support USB interfaces. These types of equipment are most commonly used for computer networking:
USB network adapters
USB broadband and cellular modems for Internet access
USB printers to be shared on a home network
For computer-to-computer file transfers without a network, USB drives are also sometimes used to copy files between devices.
Connect two devices directly with one USB cable by plugging each end into a USB port. (Some devices feature more than one USB port, but do not plug both ends of a cable into the same device, as this can cause electrical damage!)
You may plug cables into a USB port at any time regardless of whether the devices involved are powered on or off. Follow instructions provided with your equipment before unplugging USB cables. In some cases, unplugging a USB cable from a running device can cause
Multiple USB devices can also be connected to each other using a USB hub. A USB hub plugs into one USB port and contains additional ports for other devices to connect subsequently. If using a USB hub, plug a separate cable into each device and connect them to the hub individually.