Virtual Reality Modeling Language.
VRML (pronounced "VER-mul") is the navigation specification behind 3-D objects and environments on the Web: HTML creates 2-D environments, VRML provides the source for 3-D environments. 3-D VRML worlds are used as link resources, picture galleries, or to host things like chatting and gaming, where users represent themselves using avatars, which crawl, hop, or crunch (depending on the avatar) through space, encountering other avatars, finding information, and more. To view VRML files, which have the .wrl suffix (short for world), you need to add the proper plug-in to your browser.