SVG

SVG is a text-based (specifically XML-based) representation of vector graphics. It is almost never seen in fangames due to the widespread use of raster graphics and general lack of support with game creation programs. MMF2 has an extension that can load and draw vector graphics, though its use for SVG is limited.

Being vectors, SVGs are useful as they can produce extremely small files for a given image complexity, as long as there is not a lot of detail. They are sometimes used in lieu of other formats like PNG for diagrams and lineart.

Programs such as Adobe Illustrator and Inkscape are commonly used to edit SVGs. Care must be taken to ensure vectors are exported as clean SVG, as its XML nature usually means programs will store unwanted metadata such as layer and settings information within them.