Some One Please explain the main Purpose of Intrastat Journals in Finance module in Business Central ..?

Some One Please explain the main Purpose of Intrastat Journals in Finance module in Business Central ..?
Hello,
This is from the official documentation:
All companies in the European Union must report their trade with other EU countries/regions. You must report the movement of goods to the statistics authorities in your country/region every month, and the report must be delivered to the tax authorities. This is referred to as Intrastat Reporting. You use the Intrastat Journal page to complete periodic Intrastat reports.