There are a multitude of definitions and algorithms for specifying graphics formats within Information Technlogy. Raster graphics are comprised line-by-line renditioning akin to the old TV cathode ray tube. We can think of these as bit maps or pixel-based images. Formats include PNG, GIF, JPG and BMP. An alternative format that is available is Vector graphics which are constructed mathematically with points and lines and curves. You may have seen these as Scalable Vector Graphics (SVG). Groundspeak's logo and the Geocaching Mail graphic at the top of this caching page are SVG based. These can be powerful resources that don't lose their resolution when you zoom in on a point, unlike bitmaps which pixelate as you zoom in. There are others but that may be the subject of a future geekdom puzzle.
The image shown below is a raster rendering of a vector file. But what was the original SVG and where's the cache?
