A notary is a lawyer or person with legal training who is licensed by the government to perform acts in legal affairs, in particular witnessing signatures on documents. The form that the notarial profession takes varies with local legal systems.

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. In the United States, a signing agent, also known as a loan signing agent, is a notary public who specializes in notarizing mortgage and real estate documents. Although notaries public are public officials, they are not paid by the government; they may obtain income by charging fees, provide free services in connection with other employment (for example, bank employees), or provide free services for the public good. Documents are notarized to deter fraud and to ensure they are properly executed. An impartial witness (the Notary) identifies signers to screen out impostors and to make sure they have entered into agreements knowingly and willingly. Loan documents including deeds, affidavits, contracts, powers of attorney are very common documents needing notarization.