It’s a flat file of data, each entry separated by a comma. Now, some applications make it possible to export a file to CSV format. Even Google Docs allows for such an action with Sheets.

A CSV file is a “comma-separated values” file. In plain English, this is a text file that contains an unusually large amount of data. More often than not, this is used in order to create ...

It used to be easy to analyze your Twitter data: you'd go to your settings and ask for a download, and there among all the files would be a CSV file full of your tweets and the associated metadata ...

And, of course, CSV’s organization of tabular data is perfect for things like spreadsheets. YAML is actually a superset of JSON, meaning it will support anything JSON supports.