The CSV file extension appears on text documents that contain comma-separated values. Like spreadsheet data, each line in a CSV file separates into individual values that correspond with the cells ...

Microsoft Excel has an import wizard, but if you structure the text correctly, you can bypass the wizard altogether.

And while you can import CSV files into Excel and work with them there, it can get confusing—you have to keep track of which Excel features work in CSV files, and which do not.