Spreadsheet Files are used to store data in the form of cells organized in a row and column format, with each cell containing a certain type of data like text strings, numbers, etc. Some spreadsheet file formats also support formulas that can be applied inside cells to calculate results from a set of data. Two of the most popular spreadsheet software programs include Microsoft's Excel and Google's Google Docs.
Popular Spreadsheet File Extensions
XSL — Format: XML
One of the most commonly used formats for storing spreadsheet data, the XSL (or XML Style Sheet) file format is used to specify the styling of spreadsheet data stored in an XML document. It specifies the styling of the text, tables, and objects, similar to how a CSS file is used to specify how an HTML document is displayed.