Which part of the MATLAB interface do we use to write and save programs?

In MATLAB, we use the "Editor" part of the interface to write and save programs. Here are the steps:

1. Open MATLAB software on your computer.

2. On the MATLAB interface, locate the "Home" tab on the top left corner.

3. Under the "Home" tab, find and click on the "New" button.

4. A drop-down menu will appear. Select "Script" from the options. This will open the Editor window.

5. Now, you can start writing your program in this Editor window.

6. Once you have written your program, go to the "Save" button on the top left corner of the Editor window.

7. Click on "Save" and a dialog box will appear.

8. In the dialog box, choose the location where you want to save your program, type the name of your program in the "File Name" field, and make sure the "Save as type" field is set to ".m".

9. Click on "Save" in the dialog box to save your program.

Remember, MATLAB programs are saved with a ".m" extension.