what is a xlsx file

An XLSX file is a Microsoft Excel Open XML Spreadsheet file. It is a file format used in Microsoft Excel, a spreadsheet application that uses tables to organize, analyze, and store data. Each cell in an XLSX file can contain text or numerical data, including incorporating mathematical formulas. XLSX files are stored as a compressed Zip file, which contains a bunch of other files used to open the document. The XLSX file format was introduced in 2007 and uses the Open XML standard adapted by Microsoft back in 2000. It replaced the proprietary XLS format that Excel used previously. XLSX is part of Microsoft Office Open XML specification and is supported by most spreadsheet applications, including Excel, Apple Numbers, OpenOffice, LibreOffice Calc, and more. XLSX files have added advantages of small file sizes, less changes of corruption and well-formatted images representation. To open an XLSX file, you can use Microsoft Excel or other spreadsheet apps, such as Apple Numbers, Google Docs, and OpenOffice.