GL Transmission Format (glTF™) is an extensible, open-standard file format developed and maintained by Khronos Group. It is designed to create compact files that load quickly, and represent scenes completely.

glTF and the glTF logo are trademarks of the Khronos Group Inc.
The glTF format is used to share rich 3D content between a wide variety of applications, including Unreal Engine, Twinmotion, and Sketchfab, which can import and export glTF content.