Save a file as CSV Format TextEdit on Mac

There is no direct option to save a file with a .csv file extension using TextEdit on Mac

1. Save the file as plain text: Make sure to select menu: Format -> Make Plain Text.
   
2. Now click Command ⌘ + S to save the file.
3. Have plain text encoding as UTF-8 and uncheck: If no extension is provided, use "txt".
4. Now give the file a name with a .csv extension: e.g. myfile.csv
5. This will save the file in CSV format, if you have MS Excel or Sheets it will open the file in it.