It's a file (like a document) that doesn't have any formatting information
(like bold, or underline) or formulas (like =A1+B1)--just text.  If you
opened a CSV (comma separated values) file in Word, you'd see:
Albert,14569,1234,3031234567,Green
Jennifer,8978,,8001234567,Purple
If you open the file in Excel, it separates each comma-separted value into a
separate column (if you run the "Import Text File" wizard):
A            B            C          D                     E
1 Albert     14569     1234     3031234567     Green
2 Jennifer   8978                  8001234567     Purple
A comma-delimited file is just a text file that can be read by lots of
different programs.