VGA and RGB are different but related terms that are used to describe video technology. RGB, which stands for red, green and blue, is a color model used in a wide variety of applications. VGA, or video graphics array, is used specifically to connect a computer to a display.
The concept of mixing red, green and blue to obtain a wide color spectrum was in use long before computers became popular. For example, the RBG standard is used for lighting, photography, image-editing software and component cables used to connect a video device to a TV. Additionally, RGB data cables are used to connect computers to monitors, which is why many people confuse them with VGA. However, VGA technology is more than just a color standard. Furthermore, unlike RGB, VGA technology is mostly obsolete. It has been replaced by more advanced analog technology like XGA, Super-VGA and high-definition digital technology, such as a high-definition multimedia interface, or HDMI.