The purpose of the .obj file format in 3D modeling is to store and exchange 3D geometric data, including vertices, faces, texture coordinates, and material references.
As a standard text-based format, it ensures compatibility across different 3D software. Users can transfer models between tools like Blender, Maya, and 3ds Max without losing core geometric information.
Overall, .obj is a practical choice for sharing 3D models across applications due to its wide support and ability to preserve essential data.