[1] A notary, while a legal professional, is distinct from an advocate in that they do not represent the person who engages their services, or act in contentious matters.
An impartial witness (the notary) identifies signers to screen out impostors and to make sure they have entered into agreements knowingly and willingly.
[2][3][4] To "notarize" a document or event is not a term of art, and its definition varies from place to place; but it generally means the performance by a notary of a series of possible steps, which may include the following (not an exhaustive list): Most common law systems have what is called in the United States a notary public, a public official who notarizes legal documents and who can also administer and take oaths and affirmations, among other tasks.
They are qualified lawyers who provide many of the same services as common-law attorneys/solicitors (negotiation and drafting of contracts, legal advice, settlement of estates, creation of a company and its status, writing of wills and power of attorney, interpretation of the law, mediation, etc.)
Notaries in civil law jurisdictions are specialized in all matters relating to real estate, completing title exams in order to confirm the ownership of the property, the existence of any encumbrances such as easements or mortgages and hypothecs.