what is an xlsx file

An XLSX file is a file format used in Microsoft Excel, a spreadsheet application that uses tables to organize, analyze, and store data. It is a Microsoft Excel Open XML Spreadsheet (XLSX) file created by Microsoft Excel and is supported by most spreadsheet applications, including Excel, Apple Numbers, OpenOffice, LibreOffice Calc, and more. XLSX is a zipped, XML-based file format, and each cell can contain text or numerical data, including incorporating mathematical formulas. XLSX is the default format when creating a spreadsheet using modern versions of Excel, and it replaced the proprietary XLS format that Excel used previously. XLSX files are stored as a compressed Zip file, which contains a bunch of other files used to open the document. To open an XLSX file, you can use Microsoft Excel or other spreadsheet apps, such as Apple Numbers, Google Docs, and OpenOffice.