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You received a .blend file, which means someone wants you to have the entire project — not just the model. Blender's native format saves everything: 3D meshes, materials, textures, lighting, cameras, animation keyframes, physics simulations, compositor nodes, and render settings. It's a complete project state in one file.
Blender is free, open-source, and has gone from underdog to industry competitor. Blender files are used in game development, architectural visualisation, product rendering, motion graphics, and an increasing number of Hollywood VFX pipelines. The format is tightly coupled to Blender's internals, which means other software can't open .blend files natively — you need Blender itself.
Blender (free, blender.org) opens .blend files — it's the only option, but fortunately it's an excellent one that runs on Windows, macOS, and Linux. To share 3D assets with people who don't use Blender, export to glTF/GLB (web/game), FBX (game engines), OBJ (simple geometry), or STL (3D printing). Blender's export pipeline handles all of these.