To save your work and exit AutoCAD:
1. Click the X button found in the upper right corner of the AutoCAD window.
2. If any of the open files are modified, AutoCAD will ask if you want to save or close without saving, as in the following dialog box. Choose Yes to save your work.
3. AutoCAD displays the Save Drawing As dialog box — if this is a new drawingthat has not be saved previously.AutoCAD saves your work, and then exits to the Windows desktop.
To discard the drawing and exit AutoCAD:
1. Click the X button.
2. Notice that AutoCAD displays a dialog box to confirm whether you want to save the drawing — it’s your last chance! Move the cursor to choose the No button to exit without saving your work. AutoCAD does not record your work to disk, and exits to the Windows desktop.