GLB is the binary file format representation of 3D models saved in the glTF (GL Transmission Format). By packing the glTF JSON data, binaries, and textures into a single file, GLB eliminates the issue of missing external assets. It is efficiently designed for fast loading in web and mobile applications, often described as the "JPEG of 3D." Sample GLB files are widely used for testing WebGL and AR (Augmented Reality) applications. Developers use them to verify fast loading times and correct rendering of PBR (Physically Based Rendering) materials. They are also used to test drag-and-drop functionality in 3D viewers and to validate content for social media and e-commerce platforms.