An Apostille is a type of attestation in which documents are legalized in a particular format that is acceptable in all nations that belong to the Hague Convention. Essentially, Apostille is an international attestation that is acceptable in about 92 countries, and most of the western world recognizes Apostille.
Apostille stamp is a square shaped computer generated sticker stamp, This is a unique computer generated stamp having a unique identification number, through which any member country of The Hague convention can check its authenticity online. Under normal circumstances, once the document is apostilled, it does not require to be attested further from the concerned embassy.
If a document is apostilled, it does not require to be attested.
For the list of countries that require documents to be apostilled, please refer to the following link: