The Hague Convention Abolishing the Requirement of Legalisation for Foreign Public Documents (the Apostille convention or the Apostille treaty) is an international treaty drafted by the Hague Conference on Private International Law. It specifies the modalities through which a document issued in one of the signatory states can be certified for legal purposes in all the other signatory states.
Such a certification is called an apostille (in French: certification). It is an international certification comparable to a notarisation in domestic law.
If a state which is a party to the convention certifies the document with an apostille, no further certification of that document is necessary for its use in other signatory states (find more information on apostille at the web page of the Hague Conference). Once the document is submitted to a sworn translator and translated into Slovak, it is ready to be presented to Slovak authorities.