The .vrml file format in virtual reality primarily defines and describes 3D scenes, objects, and their interactive behaviors.
It acts as a text-based standard for encoding 3D data, enabling VR systems to render environments with basic interactivity like object movement and material property display.
For simple VR projects or legacy systems, .vrml remains useful for lightweight 3D scene sharing, though newer formats such as glTF are more commonly adopted in modern applications.