What is the primary purpose of the "Undo" command in AutoCAD?

The primary purpose of the "Undo" command in AutoCAD is to reverse the last action performed. This functionality is essential for managing mistakes or changing decisions made during the design process. Users can quickly revert their last action, whether it was a drawing command, an object modification, or a layer change, allowing for a more flexible and forgiving design experience.

With the "Undo" command, designers can experiment and make edits without the fear of permanently committing to undesired changes. The capability to backtrack step-by-step is particularly useful in complex projects where numerous changes may be made in succession. This command effectively enhances the workflow by allowing for rapid adjustments and corrections, thus streamlining the design process.

Other options serve different purposes; saving a drawing, restoring previous versions, or locking objects from editing focus on broader actions within the software, while the "Undo" command specifically addresses the immediate need for reversing last actions, making it an invaluable tool during the drafting and design phases.