video graphics adapter (VGA)
Video Graphics Array(VGA) is a display format for graphical screen displays. It dates from 1987 and was developed by the IBM company and later used in various improved versions such as Super-VGA( SVGA).
The VGA format, originally introduced by IBM, has a screen resolution of 640 x 480 pixels with a displayable color depth of 4 bits, which corresponds to sixteen simultaneously displayable colors that can be taken from a color palette of 262,144 colors. With limited resolution, VGA can also display 256 colors. The aspect ratio is 4:3. In addition to the color mode, VGA also offers a monochrome mode with a resolution capability of up to 800 x 600 pixels.
VGA cards are compatible with the older graphics adapters such as Color Graphics Adapter( CGA), Enhanced Graphics Adapter( EGA) and Monochrome Display Adapter( MDA). Modern standards such as Super-VGA (SVGA), Extended Graphics Adapter(XGA), Super-XGA( SXGA), Ultra-XGA( UXGA) and Quadruple-XGA( QXGA) build on VGA and range up to a resolution of 2,048 x 1,536 pixels. The scaled-down VGA variants Half-VGA( HVGA) and Quarter-VGA( QVGA) have also been used in smartphones. They have resolutions of 320 x 480 pixels and 240 x 320 pixels.