A distinction is made in digital signatures between simple, advanced and qualified (legally valid) signatures/signatures.
With a simple digital signature, the document is combined with the applied signature to form a unique fingerprint (hash value). In addition to the simple digital signature, the advanced digital signature offers the possibility of a unique identification of the signatory. The identification can be done e.g. via e-mail address, telephone number, etc.
According to the eIDAS Regulation, a qualified digital signature is legally equivalent to a handwritten signature. However, the signature must be executed by means of a qualified signature creation device and a 2-factor authentication and must also include the name of the signatory. The qualified digital signature requires a unique identification of the person with an ID.