- Declarative language for describing Virtual Worlds
- Current version 2, standardized by Web3D Consortium
- Based on scene graphs with (non-)graphical nodes
- Primitive shapes: Sphere,Box,Cylinder,Cone,...
- Sensors: Time, Touch, Proximity,....
- Interpolators: Position, Rotation, Color,...
- Attribute to Attribute connections: Route
- Several browser plugins available (Cosmo,Cortona,Blaxxun,Worldview...)