CSV (for Comma Separated Value), is a standard text format used by most spreadsheets (Lotus 123, Excel, Quattro, etc.) to import data. Specifically, a CSV file includes commas or semicolons and line breaks that the spreadsheet uses to arrange the data in cells, rows, and columns.
The procedure for opening a CSV file varies according to the spreadsheet. For example, if you are working in a Windows environment: select the file, right-click with the mouse while pressing the shift key on your keyboard, and use the «Open with» function to select your spreasheet.
For more details, please refer to the spreadsheet help.