GLB - glTF Binary Format
A GLB file (.glb), which stands for “GL Transmission Format Binary file”. contains a binary representation of a glTF scenegraph packaged into a single binary file.
The GLB file format is a binary form of glTF that includes textures instead of referencing them as external images.
Version History
GLB was introduced as an extension to glTF 1.0
GLB was incorporated directly into glTF 2.0.