What Does Vector Graphic Mean?
A vector graphic is a type of image. Vector images are graphical representations of mathematical objects such as lines, curves, polygons and its like. These graphics are generated by computer and they follow x and y axis as their reference definition.
Techopedia Explains Vector Graphic
One characteristic of vector graphics is a very high resolution. Such images can be altered easily and their resolution per square pixel remains intact at any level. Common image formats like GIFs and JPEGs are the opposite -- these bitmap images are pixel-based and so can't be resized without losing quality. Once a vector image is rasterized to a .gif or .jpeg, they lose their original resolution.
The Scalable Vector Graphics (SVG) format is the the W3C standard for vector graphics.