A Notary, or Notary Public, can authenticate or witness most documents. A Notary can also arrange legalisation ( Apostilles) if needed. You will normally require the services of a Notary Public when you have documents which are to be used abroad. The Notary's signature and seal will verify to the authorities in that country that any relevant checks have been carried out and that the document has been properly signed. A Notary has no knowledge of foreign legal systems and is therefore unable to provide legal advice on documents.