An e-signature can be typed and is equally as legally binding as a document signed by hand. There are laws making it secure, protecting businesses' and individuals’ interests.
The audit trail acts as proof that the signature process was done properly. It shows who signed the document, when they did it, and how they verified their identity.
For a contract or legal document to be valid, check for consent, competent parties, consideration, lawful purpose, clear terms, signatures, dates, and witnesses.