Moved to General Hardware/Equipment Discussion.
If you do a search on the site, you'll find numerous threads on this topic. You don't need one, but you should have your equipment hooked up to a GFCI plug.
"What, exactly, is the internet? Basically it is a global network exchanging digitized data in such a way that any computer, anywhere, that is equipped with a device called a 'modem', can make a noise like a duck choking on a kazoo." - Dave Barry