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....first row of the “Quarter” column, and the second $C$3 is a placeholder...the first row of the “Sales” column, and the second $D$3 is a placeholder...