CSV (Comma Separated Values) is a data storage format based on text files, used mainly for storing tabular data.
Its main feature is easy machine processing. A .csv file can be opened in many different applications, such as MS Excel or QGIS.
Why is this format used in the System?
Because it is a well-known and widely accepted format. Exporting tabular data to CSV allows the data to be opened in a wide range of software, including QGIS and Excel.