What is the main difference between Model Space and Paper Space in AutoCAD?

The main distinction between Model Space and Paper Space in AutoCAD lies in their respective functions and purposes within the design workflow. Model Space is primarily where the actual design or model is created. It provides a 3D environment where users can draft, model, and work on their projects without constraints. This is where all dimensions, elements, and details of the design are accurately represented and manipulated.

On the other hand, Paper Space is used for preparing plots and layouts for printing or presentation purposes. In Paper Space, users can set up different views of the Model Space as well as arrange title blocks, annotations, and other graphical elements that are necessary for the final output. Essentially, Paper Space allows users to organize how their designs will look on paper, accommodating different viewports that can show various parts of the model in different scales or perspectives.

This clear division of purposes makes the correct answer stand out, as it emphasizes the functional roles each space plays in the design and presentation processes within AutoCAD.