GIF
stands for Graphics Interchange Format. The GIF uses the 2D raster data type and is encoded in binary. GIF files ordinarily have the .gif extension.
Living Documentation
Living documentation is a dynamic system documentation that provides information that is current, accurate and easy to understand. Documents that are written in a natural language format serve as the core of living documentation. Your content experts can review the documentation to ensure that it describes the desired behavior of the system from a logical standpoint.
PNG
is a Portable Network Graphics) is a file format for image compression that was designed to provide a number of improvements over the GIF format. Like a GIF, a PNG file is compressed in lossless fashion (meaning all image information is restored when the file is decompressed during viewing). Files typically have a .png extension.