The digital signature, also called electronic signature, is a legally binding method by which digital documents such as a PDF can be signed and thus give your consent.
The legal framework for electronic signatures is laid down in the eiDAS Regulation (European Regulation on Electronic Identification and Trusted Services for Electronic Transactions) of the European Union. It also defines the requirements for the three different levels of electronic signatures.
the simple electronic signature (EES)
the advanced electronic signature (FES)
the qualified electronic signature (QES)
The three types of eSignatures are essentially distinguished by the level of security. Here they differ in the probative value, i.e. in the degree of confidence in the identity of the signatory and in their proof that the signed document is actually the one submitted.
However, it does not always make sense to use a multi-factor authentication method when a simple or advanced signature can already have a reasonable level of validity and security.
Here is a brief explanation of the main differences between the three levels of eSignature and typical applications.