OBJ (Wavefront Object) is a universally accepted open geometry definition file format. Developed by Wavefront Technologies, it is a simple, human-readable text format that represents 3D geometry (vertices, texture coordinates, normals, and faces). Because of its simplicity and open nature, it is supported by almost every 3D modeling and animation software in existence. Sample OBJ files are the standard for testing 3D import/export capabilities. Developers use them to verify that geometry buffers are correctly populated and that texture mapping (UVs) aligns properly with the mesh. They are also used to test parser performance and to validate the handling of multi-object scenes.