A notary public is a state official appointed by state government to witness the signing of important documents, administer oaths and affirmations, certify copies of certain documents, and in some states write affidavits, depositions, and protests. The most important purpose of the notary public is to make sure that the person who signed the document is properly identified and that there is a permanent record of the information pertinent to the signing in the notary journal. Please keep in mind that state laws differ and that not all notarizations in all states require identification.