Comma-separated values | CSV wikipedia
""CSV" is not a single, well-defined format (although see RFC 4180 for one definition that is commonly used). "
RFC 4180 tools.ietf.org
Common Format and MIME Type for Comma-Separated Values (CSV) Files
The Comma Separated Value (CSV) File Format creativyst.com
"CSV does have one advantage over XML for specification in new designs. CSV has much lower overhead, thereby using much less bandwidth and storage than XML. For new designs where overhead issues have high importance or criticality, CSV, or a more robust low-bandwidth alternative, may be the better choice.
Especially in requirements that utilize high-cost bandwidth and where large amounts of data must be moved often, CSV may be better specified. "