ZBrush is a powerful digital sculpting and 3D modeling software widely used in the entertainment industry. It offers a wide range of features for creating high-quality 3D models, and exporting OBJ files from ZBrush allows you to use your models in other 3D applications. Here's a step-by-step guide on how to export an OBJ file from ZBrush:

1. Finalize Your Model: Before exporting your model, make sure it's finalized and ready for export. Check for any errors or imperfections that need to be fixed before proceeding.

2. Go to the Tool Palette: In ZBrush, go to the Tool palette and select the subtool that you want to export as an OBJ file. If your model consists of multiple subtools, you can export each subtool separately or merge them into a single subtool before exporting.

3. Export as an OBJ: With your desired subtool selected, go to the Tool palette, click on the Export button, and select the OBJ option. This will prompt you to choose a location and name for the exported OBJ file. Make sure to remember the location for easy access.

4. Adjust Export Settings: In the export dialog box, you can adjust the export settings such as scale, export options, and other preferences depending on your specific needs. Once you're satisfied with the settings, click on the Export button to save the OBJ file.

5. Verify the Export: After exporting the OBJ file, it's a good practice to verify the file in other 3D software to ensure that the export was successful and the model looks as expected.

By following these simple steps, you can easily export an OBJ file from ZBrush and use it in other 3D modeling and rendering applications. Whether you're creating characters for animation, designing props for games, or exploring digital sculpting, ZBrush's OBJ export feature allows you to seamlessly integrate your creations into your workflow.