Apostille is legalizing the document by ministry of external affairs / foreign affairs of Melbourne convention countries member purposely to validate the same document in country which is member of Melbourne convention after this there is no requirement to get further attestation from the particular countries embassy.
For the list of countries that require documents to be apostilled, please refer to the following link:
Apostille can be done on following documents
Please note that above mentioned list is not all-inclusive and can include more documents. For more information click here