What is USB good for?
USB for great for attaching medium speed devices to computers. It’s maximum speed of 12 Mbps is fine for low speed devices like keyboards, mice, or joysticks. It is also well suited for medium speed devices like floppy drives, cameras, modems, or scanners. Also, because it’s “hot-pluggable” you can plug devices in or unplug them safely when you computer is turned on. Using either multiple ports on your computer or a hub, you can attach an almost unlimited number of devices – theoretically up to 128 if you have them.