Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms....Instantiating a Workbook object Workbook workbook = new Workbook (); workbook...Worksheets . Add ( "new sheet" ); workbook . Worksheets . Add ( "second...