It belongs to TrueType and OpenType font formats and has analog compression that stores rendering technology. In WOFF it’s possible to store individual metadata with font info. It’s been used since 2010 for the main purpose of storing and transferring fonts on the Internet. It was developed by the Mozilla Foundation.
This format is used to store background images in uncompressed form in the X Windows System user interface for remote server maintenance. It stores a 'dump' or screenshot of the window or background of the client program. It may include different colors depending on the capabilities of the graphics card that is used to create the XWD file.