OBJ (or .obj) is a 3D geometry definition format used in computer graphics for representing 3D models and their associated data. It is a widely supported file format for exchanging 3D model data between different software applications. OBJ files can contain both the geometry of the 3D model (vertices, faces, and texture coordinates) as well as material properties such as color, texture, and lighting information. These files are commonly used in 3D modeling, 3D rendering, and computer-aided design (CAD) applications. The OBJ file format was originally developed by Wavefront Technologies for their Advanced Visualizer software, but it has since become a standard format for 3D models and is supported by many 3D modeling and rendering software packages. Importantly, OBJ files are text-based, which means they can be easily read and edited using a text editor. This makes them a versatile and widely used format for storing and sharing 3D models and their associated data. OBJ files can also include references to external texture files, allowing 3D models to be represented with realistic surface details and appearances. This makes them suitable for use in animation, video games, virtual reality, and other applications where realistic 3D graphics are required. Understanding the OBJ file format is essential for anyone working with 3D modeling, design, and graphics. Knowing how to create, import, and export OBJ files can enable seamless collaboration and interoperability between different 3D software tools. Whether you're a professional 3D artist, a game developer, an architect, or simply an enthusiast interested in 3D design, understanding the OBJ file format is a valuable skill that can enhance your ability to create and work with 3D models. In summary, OBJ files are a widely used and versatile file format for representing 3D models and their associated data. Understanding their structure and usage can open up a wide range of possibilities in the field of 3D modeling, design, and graphics.