Manipulating Excel documents with code is more than just a value-add process in many environments.   It’s often a necessity, eliminating the manpower that would otherwise be committed to the monotonous task of adjusting large and complex spreadsheets in a predictable, cyclical way.

Thanks to various open-source libraries (like Apache POI, for example), programmatically creating, manipulating, and deleting Excel data is reasonably straightforward for experienced developers. Libraries like these provide a layer of abstraction between the developer and the behind-the-scenes “button-pressing” required to make XLSX (open office Excel) files perform actions akin to what we might accomplish with points and clicks in the Excel application. 

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