What is the purpose of the "REGEN" command in AutoCAD?

The "REGEN" command in AutoCAD serves the specific purpose of regenerating the current view and recalculating the display of objects within that view. This command is crucial when changes are made to the drawing, such as modifying polylines, adding or editing entities, or adjusting layers. By executing "REGEN," AutoCAD updates the display to reflect these changes accurately, ensuring that all elements are drawn correctly and that the visual representation on the screen aligns with the current state of the drawing data.

Other options, while related to AutoCAD functionality, serve different purposes. Creating new layers is managed through commands specifically designed for layer management, not through "REGEN." Similarly, saving changes is accomplished through the "SAVE" command or similar functionalities. The "UNDO" command is specifically designed to reverse the last action taken, which is also not related to the "REGEN" command. Therefore, understanding the functionality of "REGEN" enhances a user's ability to maintain an accurate visual context while working in AutoCAD.