The button on the far left of the Taskbar in Microsoft Windows (up to and including Windows 7). Click on it to access all the programs installed on your computer, as well as printers, and the Control Panel. Users of Windows 8 have bemoaned the disappearance of the start button which has made a "sort of" reappearance in Windows 8.1
Universal Serial Bus. A standard that allows quick and easy connection of external peripherals such as storage devices to your computer. Devices can be added or removed while your computer is switched on.