A CSV is a comma-separated values file, which allows data to be saved in a tabular format. A comma-separated values file is a delimited text file that uses a comma to separate values. A Comma Separated Values (CSV) file is a plain text file that contains a list of data. A comma-separated values (CSV) file is a delimited text file that uses a comma to separate values. CSV is a simple file format used to store tabular data, such as a spreadsheet or database. This video will show you how to make a CSV or comma separate value file.