VGA (Video Graphics Array) is a basic standard for color resolution in computer monitors that, today, represents the lowest common denominator for compatibility. For example, when a computer boots into the Microsoft™ Windows™ operating system, the opening or Windows logo is presented in VGA mode using a palette of 32 colors and a resolution of 640 x 480. Once the system is fully loaded, the video card’s takes over at a higher resolution.
In 1987 IMB introduced VGA, which manufacturers adopted en masse. This led to the longstanding tradition of VGA being the “base” or “fall back” display standard of video hardware. Every modern graphics adapter or card is capable of displaying the VGA mode, but will only do so if the proper device driver is not present or cannot be located; if it has been purposely disabled; or if the operating system cannot find a better driver. In Windows operating systems, booting into Safe Mode will display VGA, as unnecessary are not loaded in this case.
With televisions, HDMI is the most common connector. But if you want to connect a computer to your TV (or you've got a new computer monitor), the options tend to be HDMI, DisplayPort, DVI, and sometimes old-school VGA.