It has the capability of
"hot plugging" which is the ability for plugging and unplugging
a device without powering down. Now there are many motherboards than
came with 2 USB ports available, being common in both Mac and PCs.
USB devices are self-identifying, and USB is Plug-and-Play compliant,
which means that installation and configuration of USB peripherals
will be relatively easy.
USB cables also carry power,
so you don't need extra cables or transformers. · USB ports
on your computer will work with any USB peripheral that you want to
plug into it.
USB is also "hot-swappable":
you can plug stuff in or out without turning off the computer
One disadvantage is that
is has to use a Windows98 or higher operative system and Windows NT
doesn't support USB.