Blender is a powerful 3D modeling and animation software that allows you to create stunning 3D models. If you want to share your 3D models with others or use them in other software, you may need to export them in a widely supported format such as OBJ. Here's how you can export OBJ file in Blender:

1. Open your 3D model in Blender: First, open your 3D model in Blender by using the File > Open option or by creating a new model from scratch.

2. Prepare your model for export: Before exporting your model, make sure that it is properly textured and UV-mapped. You may also want to check the scale and rotation of your model to ensure it looks the way you want it to in other software.

3. Select the model you want to export: In Blender, you can export multiple objects at once, but you need to select the objects you want to export. If you want to export the entire scene, you can skip this step.

4. Go to File > Export > Wavefront (.obj): Once you have your model ready for export, go to the File menu, then select Export and then Wavefront (.obj). This will open the export settings for the OBJ file format.

5. Adjust export settings: In the export settings, you can adjust various options such as the file path, scale, and whether you want to export materials and textures along with the model. Make sure to set these options according to your needs.

6. Click Export OBJ: After adjusting the export settings, click the 'Export OBJ' button to save your 3D model in OBJ format.

Congratulations! You have successfully exported your 3D model as an OBJ file from Blender. You can now share it with others or use it in other 3D modeling and rendering software.

Exporting OBJ file in Blender is a simple process that allows you to share your 3D creations with the world. Whether you are a 3D artist, designer, or hobbyist, knowing how to export OBJ file in Blender can open up new possibilities for sharing and collaborating with others. Start exporting your 3D models today and see where your creativity takes you!