A notary seal is an official mark used by a notary public to authenticate documents. This seal typically includes the notary's name, the state where they are authorized, and their commission number. It serves to verify that the notary has witnessed the signing of a document and that the signatures are genuine. The notary seal is important in legal and financial transactions, as it adds a layer of trust and credibility. Many documents, such as wills, contracts, and affidavits, may require a notary seal to be considered valid and enforceable in a court of law.