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You're building a web 3D experience, an AR application, or a product viewer. glTF (GL Transmission Format) is the open standard for 3D scenes — compact, fast to parse, and designed for real-time rendering rather than offline production. It's been called "the JPEG of 3D," and the comparison is apt.
glTF was developed by the Khronos Group (the same organisation behind OpenGL, Vulkan, and WebGL). The format is JSON-based — you can open a .gltf file in a text editor and read the scene graph, materials, and animation data directly. Textures and mesh data are stored in external .bin and image files (or embedded in a single GLB file). glTF 2.0 supports PBR (physically-based rendering) materials, skeletal animation, morph targets, and extensions for advanced features.
Blender, Windows 3D Viewer, and every major game engine import glTF. Three.js and Babylon.js render it natively in the browser. For sharing 3D models on the web, glTF/GLB is the standard — it's efficient, open, and universally supported by modern 3D tools.