The file format commonly used for 3D models in computer graphics is OBJ. This format, developed by Wavefront Technologies, supports the representation of 3D geometry and is widely adopted in various applications, including gaming, animation, and 3D printing. OBJ files typically contain information about the vertex, texture, and normals of 3D objects. Their simplicity and compatibility with many 3D software tools make them a popular choice for artists and developers working with three-dimensional graphics.