A notary, also known as a notary public, is an official appointed by the government to serve as an impartial witness to the signing of important documents. The primary role of a notary includes:

1. Verifying Identities: Confirming that the individuals signing documents are who they claim to be.
2. Witnessing Signatures: Ensuring that signatures are made willingly and without duress.
3. Administering Oaths and Affirmations: Performing official acts in which an individual swears or affirms that the information provided is true.
4. Preventing Fraud: Helping to prevent fraud by verifying the authenticity of signatures and the identity of signers.

The types of documents that often require notarization include contracts, deeds, affidavits, powers of attorney, and other legal documents. The specific duties and authority of a notary can vary by jurisdiction.