Microsoft Excel is a spreadsheet developed by Microsoft for Windows, macOS, Android and iOS. It features calculation, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications. It has been a very widely applied spreadsheet for these platforms, especially since version 5 in 1993, and it has replaced Lotus 1-2-3 as the industry standard for spreadsheets. Excel forms part of the Microsoft Office suite of software.

Mail merge consists in combining mail and letters and pre-addressed envelopes or mailing labels for mass mailings from a form letter.

Microsoft Word can insert content from a database, spreadsheet, or table into Word documents.

This feature is usually employed in a word processing document which contains fixed text (which is the same in each output document) and variables (which act as placeholders that are replaced by text from the data source).

Mail Merge is a powerful tool for writing a personalized letter or E-mail to many people at the same time. It imports data from another source such as Excel and then uses that to replace placeholders throughout our message with the relevant information for each individual we are messaging.