If you're creating 3D models in Blender and need to share them or use them in another 3D software, saving your models as OBJ files is a convenient way to do so. Here's how you can save your 3D models as OBJ files in Blender:

1. Open your 3D model in Blender and make sure it is ready for export. This includes checking for any issues such as non-manifold geometry or overlapping faces.

2. Once your model is ready, go to File > Export > Wavefront (.obj) to bring up the export options.

3. In the export options, you can specify the file path where you want to save the OBJ file, as well as the scale and other settings for the export. Make sure to adjust the settings according to your requirements.

4. Click on the 'Export OBJ' button to save your 3D model as an OBJ file.

5. You can now use the OBJ file in other 3D software or share it with others for viewing or editing.

By saving your 3D models as OBJ files, you can ensure compatibility with a wide range of 3D software and platforms. This makes it easier to collaborate with others, share your work, or use your models in different projects.

Additionally, when saving as an OBJ in Blender, you have the option to include the material files (.mtl) along with the OBJ file, which can preserve the material information of the 3D model. This can be useful if you want to ensure that the appearance of the model remains consistent when imported into other software.

In conclusion, saving your 3D models as OBJ files in Blender is a simple and effective way to ensure compatibility and shareability. Whether you're collaborating with other 3D artists or working on different projects, exporting your models as OBJ files can help streamline your workflow and make your 3D creations more accessible to others.