Filing an apostille (which is French for "certification") is the legal process to certify documents for international usage. [This is pursuant to the Convention of 5 October 1961 Abolishing the Requirement of Legalization for Foreign Public Documents]. Apostilles generally validate the document’s country of origin, identities of the signatories, place and dates of certification and the signatures of the authorities issuing the certificates.
To conduct international banking your corporation will require an apostille within the country you intend to conduct business. (Other requirements may also need to be satisfied). Some countries require certified copies of your Articles of Incorporation/Organization with a gold seal. A document that has been Apostilled, authenticates those documents and makes them legal for use in the non-US country.