.fbx
FBX modelFilmbox
A 3D interchange format owned by Autodesk, which came from Kaydara’s FiLMBOX software. It holds meshes, materials, skeletons, cameras and animation, in binary or ASCII.
Moving rigged and animated characters between Maya, 3ds Max, Blender, Unity and Unreal.
Opens in Blender, Maya, 3ds Max, Unity, Unreal Engine
About FBX files.gltf
glTF modelGL Transmission Format
An open 3D format from the Khronos Group, first released in 2015. A JSON file describes the scene and points to separate binary buffers and texture images.
Exchanging real-time 3D scenes with materials and animation between tools and engines.
Opens in Blender, three.js, Godot, Unity and Unreal (with plug-ins)
About GLTF files