What is the difference between an apostilled, notarized legalized and sub legalized document?

Apostille: is an authentication which verifies the seals and signatures of officials on public documents such as birth certificates, court orders, or any other document issued by a public authority so that they can be recognized in foreign countries that are members of the 1961 Hague Convention Treaty. Refer to https://www.gsccca.org/notary-and-apostilles/apostilles/hague-apostille-country-list Notarized: is an authentication by a notary public who is qualified by the state in the country of which the document was issued. Legalization: is an authentication stamp from the embassy of which the country the document will be sent to is used. Sub legalization: is the authentication of the ministry of foreign affairs in the country that you are requesting IP services in.