CSV files are simple text files containing tabular data. Each field in the
file is separated from the next by a comma. Most spreadsheets support this format,
although you can create and edit CSV files with any text editor. Files in the
CSV format end with the .csv suffix. Both QuickBooks and Microsoft
Excel can easily import and export files of this type.
About importing data from an Excel or CSV file
About exporting data to an Excel or CSV file