To verify the legality of your certificates, you'll need a certificate attestation. It's a legal document, after all. You might not be able to work in that nation without it. A legal proof of your educational status is a certificate attestation. Attestation of Certificate does not allow the registration of the document in case the document has been issued in another country. The second reason is to make sure that the document is genuine, since there is a possibility of the document being forged.