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.
ODS is a spreadsheet file extension that is based on open source XML. Although it is primarily associated with Open Office and Star Office, it is a universal spreadsheet format that can be used in both Open source spreadsheets and Microsoft Excel. The spreadsheet can contain data on columns and rows.
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