Vector graphics are infinitely scalable images created using mathematically defined elements. In simpler terms, you can make a vector graphic as large or small as you want without losing any quality.

If you work with computers sooner or later you’re going to find you need an image that is in a raster (AKA bitmap) format (e.g. .gif, .jpg, .wmf) translated to a vector format (e.g. .svg, .cgm, .dwg).