A file format extension for Microsoft Excel spreadsheet files, used to store and organize data in rows and columns.
Acronym standing for 'Excel Spreadsheet', introduced by Microsoft in the 1980s. The 'x' represents Excel, 'l' for 'layout' or simply continues the Excel branding, and 's' for spreadsheet.
The .xls format revolutionized business data management by making complex calculations accessible to non-programmers. Despite newer formats like .xlsx, many people still use 'xls' generically to refer to any spreadsheet file, showing its cultural impact.
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