Digital signature documents are a form of electronic signature that offers more detailed and secure authentication than a typical handwritten signature. They are used for verifying the identity of someone who has sent a document, or to legally bind an agreement, without the need for physical paperwork. A digital signature document provides another layer of security by encrypting the document or file before it is sent, allowing only the intended recipient to open and access the content. Additionally, these documents can be securely stored and accessed from anywhere in the world and tracked to ensure that contracts and agreements are kept up to date and legally valid.