A comma-separated values (CSV) file is a delimited text file that uses a comma to separate values. Each line in a .csv file is a data record consisting of one or more fields, with each field separated by a comma. A .csv file can be imported to and exported from programs that store data in tables, such as Microsoft Office Excel, LibreOffice, or OpenOffice. When you open a .csv file in a spreadsheet, the spreadsheet uses the comma as the field separator (delimiter).Read more