Creators on platforms like ArtStation or Free3D package models this way to ensure compatibility across different software.
A high-fidelity format by Autodesk that supports complex data like animation, textures, and skeletal rigs. FBX OBJ.rar
3D File Formats: OBJ, FBX, GLB, USDZ, and Delivery - Threedium Creators on platforms like ArtStation or Free3D package
A compressed folder used to bundle these files into a single, smaller download. Common Uses for These Files FBX OBJ.rar
Using pre-made "basemeshes" to jumpstart a sculpting or texturing project in software like 3ds Max . How to Open Them