Data Exchange Format 9 (DXF 9) is a file format developed by Autodesk for enabling data interoperability between different software applications. It is commonly used in computer-aided design (CAD) to facilitate the sharing of drawings and models. DXF files contain information about the geometry, layout, and attributes of design elements, making it easier for users to collaborate across various platforms. The DXF 9 format supports both 2D and 3D data, allowing for a wide range of applications in engineering, architecture, and manufacturing. By providing a standardized way to exchange design information, DXF 9 helps streamline workflows and improve efficiency in projects involving multiple stakeholders.