You can insert or generate the data for the CSV file in Microsoft Office Excel 2007 and then save the file in CSV format. CSV files outputted by Excel 2007 can be used in any program that can read ...

Click the "Save as Type" drop-down list and select the "CSV (Comma Delimited)" option. Click the "Save" button. Excel saves the file in pipe-delimited format in the folder you selected.

If you've encountered a CSV file and you're unsure what they're for, the good news is they're pretty straightforward and easy-to-use with apps you already know.