When someone wants to create a virtual world, she uses the Virtual Reality Modeling Language (VRML). VRML lets people create 3D worlds not by drawing them, but instead by using the VRML computer language to describe the geometry of a scene. VRML files are much smaller than graphics files. VRML files are simply text files containing instructions for drawing the VRML world. VRML files end in a .wrl extension. After the world is created, it is posted on a web server.