A virtual device driver (VxD) is a software device driver that emulates hardware and other devices so that multiple applications running in protected mode can access hardware interrupt channels, hardware resources and memory without causing conflicts. The Vxd was superseded by the Windows Driver Model (WDM) and is now obsolete.
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.
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.
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