Opening OBJ files allows you to access and work with 3D model files in OBJ format, which are commonly used for 3D printing, 3D animation, and 3D design projects. If you're new to 3D modeling and design, understanding how to open OBJ files is essential for accessing and editing 3D models. Here's a beginner's guide to help you get started:

1. Choose the Right Software: To open OBJ files, you'll need 3D modeling software like Blender, Autodesk Maya, or ZBrush. These software programs support OBJ files and provide tools for viewing and editing 3D models.

2. Import OBJ File: Once you have the 3D modeling software installed, you can import the OBJ file by navigating to the 'File' menu and selecting 'Import'. Choose the OBJ file from your computer and click 'Open' to import it into the software.

3. Explore the 3D Model: After importing the OBJ file, you can explore the 3D model within the software. Use the software's viewing tools to rotate, zoom, and inspect the 3D model from different angles.

4. Edit the 3D Model: Depending on your project goals, you may need to edit the 3D model. With the 3D modeling software, you can make adjustments to the geometry, textures, and materials of the 3D model to suit your design needs.

5. Export the Modified File: Once you're done editing the 3D model, you can export it back to the OBJ format or convert it to other file formats for use in your projects.

By following these steps, you can open OBJ files and begin working with 3D model files in OBJ format. As you gain more experience with 3D modeling and design, you'll discover the versatility and creative potential of working with OBJ files. Whether you're creating 3D printable models or crafting 3D animations, understanding how to open and manipulate OBJ files is a valuable skill for any aspiring 3D designer.