An advanced electronic signature (AES) is suitable for documents with heightened liability, proof, or security requirements. It is uniquely associated with the signatory, enables the signatory’s identification, and makes any subsequent changes to the document detectable. Typical use cases include contracts, permits, personnel records, or business agreements for which a qualified electronic signature is not legally required. However, the appropriate type of signature always depends on the specific document and the applicable formal requirements. You can learn more about the differences between EES, FES, and QES in our overview of all e-signature standards.