What is the difference between VGA, SVGA and uxga?

No matter what resolution the monitor or graphics card can support, they are usually called VGA. The naming conventions listed above have never really been accepted by the public. Therefore, even the most high-end 3-D graphics cards, companies like NVIDIA or ATI will have what they call VGA ports (except DVI ports in many cases), Even though the card may output a resolution greater than 1920 x 1440.
Some high-end displays support resolutions up to 2048x1536 @ 79hz, which is still part of the same MultiSync format and backward compatible with lower resolutions. Most high-end display manufacturers do not mention VGA, SVGA, etc. they usually call the display CRT, LCD or plasma display, and list the maximum resolution and refresh rate they support.