CSV
Comma-Separated Values -- a flat, row-and-column text format that opens directly in spreadsheet software.
CSV (Comma-Separated Values) stores data as plain text rows with values separated by commas, one record per line. It's the most universally compatible export format -- every spreadsheet tool, database, and BI platform can read it -- but it only handles flat, tabular data well. Nested or one-to-many relationships need to be flattened or split into multiple CSV files.
Example
A CSV export of the GSC Dataset Template has one row per query/page combination, with columns for clicks, impressions, and position.