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VGA
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(Video Graphics Array) The display standard for the PC. All PC display adapters support VGA, and Windows machines boot up in "VGA mode" before switching to higher resolutions. The term also often refers to the 15-pin plugs and sockets that connect the computer to the monitor. In this context, VGA refers to the traditional analog connection to a monitor in contrast to DVI, which is digital. Analog CRTs use VGA, and modern flat panel displays have both VGA and DVI inputs. See DVI.

VGA Is Base Level
VGA resolution is 640x480 pixels with 16 or 256 colors. This base resolution is used when booting the PC, and it is also used in Safe Mode for troubleshooting, because the display driver set at a higher resolution could be causing the problem. Although nothing stops a user from keeping this resolution, very little data would appear on screen (see illustration below). However, the small screens in handheld devices may well use VGA or even lower resolutions.

VGA History
VGA was introduced on IBM's PS/2 line in 1987 and quickly made the earlier CGA and EGA display interfaces obsolete, which were actually digital, but with lower resolution. In a short time, non-IBM vendors boosted the base resolution and colors to so-called "Super VGA." Over the years, resolution has been extended way beyond the original specification. See how to select a PC monitor.




Screen Resolutions
Modern PC display adapters support resolutions up to 1600x1200 and more. This illustration compares the viewing area for each of the resolutions.





The VGA Port
The VGA socket on the back of a PC uses a high-density DB-15 connector, which is contrasted here with the full-size DB-15 as well as the DB-9, which shares the same shell size. See D-sub connectors.
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