VGA stands for Video Graphics Array and is a standard for the video interface between a computer and a monitor or TV.
VGA resolution is 640×480 pixels and has 16 or 256 colors. It was introduced by IBM and soon adopted by a large majority of PC manufacturers, making it a common factor on most PCs and laptops. Even though DVI and HDMI standards have become popular with HD TVs, VGA connectors are still widely used to connect PCs and laptops to TVs.
SVGA refers to Super VGA which is a higher resolution 800×600 pixels and also allows for a larger range of colors.