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XLSX is a more modern version of the XLS format used by Microsoft Excel. It stores spreadsheet data in an open XML format, offering better file compression and compatibility. XLSX files support complex formulas, charts, and formatting options, and they are widely used for business and financial data analysis.
XLS is a file format used by Microsoft Excel for storing spreadsheet data. It supports a wide range of functions, including calculations, graphs, and formulas. XLS files are commonly used in business, finance, and data analysis. However, it has been replaced by XLSX in newer versions of Excel for better compatibility and file size.