What is the difference between single authentication and dual authentication notarization certificates?

Authentication includes single authentication and dual authentication

Single authentication refers to Apostille authentication, also known as Ministry of Foreign Affairs authentication. Double authentication requires authentication by the embassy and consular offices of China and the country of use.

Documents generally used in China require double authentication. , whether to do dual certification or not, or should you ask the agency that requires and provides certification, and then follow their requirements. But if it is used in a country that is a member of The Hague, just do a single certification. If you are studying abroad or immigrating, most of what you need is dual authentication, because you need to obtain it for use in the other country.