The U.S. Code defines an electronic signature for the purpose of US law as "an electronic sound, symbol, or process, attached to or logically associated with a contract or other record and executed or adopted by a person with the intent to sign the record."[11] It may be an electronic transmission of the document which contains the signature, as in the case of facsimile transmissions, or it may be encoded message, such as telegraphy using Morse code.

A major reason that faxes are still popular is because a faxed signature is recognized by law as equivalent to a signature you signed on a physical document. In fact all 50 states have adopted this view, but im not sure other "electronic signatures" such as signing your name with a touch pad and emailing it are recognized so broadly. http://en.wikipedia.org/wiki/Electronic_signature#In_Contract_Law

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