Another name given to a digital signatur [1] is called a qualified signature, which is more commonly used in European countries. The thing to remember, regardless of what you call this type of signature, is that they are the same thing. This type of signature provides the ability to securely sign and authenticate a variety of electronic data types, such as documents, forms, and files.
A digital signatur is ideal for any organization which wants to speed up approval processes requiring a signature. In place of traditional methods of pushing paper around the office, or through the mail, these forms can be sent electronically. Sending a document electronically only takes a fraction of the time. Using this type of signature process also makes it easier to track the status and location of the document.
Links:
[1] http://www.digi-sign.com/products#category_137