USB
Universal Serial Bus is an industry standard for connecting peripheral devices to the computer. With USB, you can connect a variety of devices, such as printers, scanners, external storage devices, keyboards, and joysticks. USB is built in to all Macintosh computers since the original iMac shipped in 1998. Many Apple computers have two USB ports. USB plugs, ports, and cables are often labeled with this standard USB symbol:
Mac OS X includes several USB kernel extensions, installed in /System/Library/Extensions, that are read into memory as Mac OS X is starting up. This provides access to USB keyboards and other devices very early in the startup ...
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