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You downloaded a 3D model from a marketplace, a scan service, or a tutorial. It's an OBJ file — probably the simplest widely-supported 3D format in existence. OBJ stores geometry (vertices, faces, normals, texture coordinates) in plain text. Open one in a text editor and you can literally read the coordinates.
Wavefront Technologies created OBJ in the 1980s for their Advanced Visualizer software. The format's survival is entirely due to its simplicity — no proprietary encoding, no binary blobs, just structured text that any programmer can parse in an afternoon. OBJ files are typically paired with .mtl (material) files that define colours, textures, and surface properties. The limitation is that OBJ doesn't support animation, rigging, or scene hierarchy — it's static geometry only.
Blender (free), MeshLab (free), and Windows 3D Viewer all open OBJ files. Every CAD and 3D application can import and export OBJ. For 3D printing, OBJ works but STL is more standard. For web delivery, convert to glTF. OBJ is the format you use when you need maximum compatibility and don't need animation.