XLSX
An Excel spreadsheet is a file that exists of cells in rows and columns and can help arrange, calculate and sort data. Data in a spreadsheet can be numeric values, as well as text, formulas, references and functions.
Each line within a .XLSX file contains a row of values, which can be numbers or letters, and each value is separated by a comma (or another delimiter). The very first line is a header row containing a list of labels. These labels refer to different columns of values.
Example:
