Document Preview is a feature commonly found in software applications that allows users to view a document before printing or finalizing it. This function displays the document as it will appear in its final form, helping users to check formatting, layout, and content for any errors or adjustments needed. By using Document Preview, users can save time and resources by ensuring that everything looks correct before proceeding. This feature is especially useful in applications like word processors and PDF viewers, where visual confirmation can prevent mistakes and enhance the overall quality of the final output.