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A typical USB hub can accommodate several USB devices.
Master-slave architecture
The computer (the "master") dictates data flow to, from, and
between attached USB devices (the "slaves").
Cable length up to 5 m (16.4 ft.)
On-bus power
USB can supply enough electricity to run many low-power devices—
such as keyboards, scanners, and memory card readers—eliminating
the need for an electrical outlet in many cases.
Plug & Play
USB does not require ID numbers or terminators. On most
operating systems you do not need to install drivers.
Hot-Pluggable
You can add/remove devices while the computer is running. Always
unmount a hard drive before turning it off or disconnecting it.
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