The "M" of XLSM stands for macro. Macros are programs embedded in Office documents used to automate different tasks. Staring from Excel 2007, XLSX spreadsheets that contain macros are saved with the XLSM extension.
XLSX is a proprietary spreadsheet file of Microsoft Excel that contains data. It contains data in rows or columns as well as charts. XLSX supports several mathematical functions also. It uses Open XML standard for containing data. It supports MS Office 2007 and above versions.
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