A notarial certification is a high-level certification by a qualified legal professional. They will certify a document in a certain way, depending on the requirements. This may include certifying a signature to confirm the identity of the signer or certifying that a document copy is accurate to the original – notarisation is a fraud-deterrent process to ensure documents can be trusted.
Some countries may only need a notary’s signature (notarisation) to certify a document, but others may require additional steps of legalisation and authentication. The key difference between notarisation and legalisation is who does the verifying – a notary will verify the signature on a document, but legalisation is usually done by government embassies or consulates who will verify the notary’s signature.