An Electronic Signature Document (ESD) is a legally binding agreement made electronically that requires the signee’s consent. An ESD can take any shape or form, from physical documents to digital signatures on a PDF document, mobile phones, or biometric data. This is an important tool for businesses and entities of all sizes as it allows them to quickly and securely enter into contracts with their customers. Not only does this simplify paperwork and reduce overall costs, but it helps make sure that every agreement is secure, legitimate, and unmistakably verifiable.