India, since 2005, is a member of the Hague Convention of October 5, 1961 that abolished the requirement of legalization of foreign public documents. Apostille is acceptable in 81 member-countries of the Convention.
Apostille is done on personal documents like Birth/Death/Marriage Certificates, Affidavits, Power of Attorney, etc. & and educational documents like Degree, Diploma, Matriculation and Secondary Level Certificates etc. Any document Apostilled in one member country is acceptable in all the other 80 member-countries, signatory to the referred convention of 1961 thus greatly simplifying the process of attestation by making it needless to get the documents attested in each or for each of the countries separately.
Under normal circumstances, once the document is Apostilled, it does not require to be attested further from the concerned embassy. For the list of countries that require documents to be Apostilled, please refer to the following link. (click here)