A signature is a stylized script associated with a person. It is comparable to a seal. In commerce and the law, a signature on a document is an indication that the person adopts the intentions recorded in the document.
An electronic signature is any legally recognised electronic means that indicates that a person adopts the contents of an electronic message.
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. Increasingly, encrypted digital signatures are used in e-commerce and in regulatory filings as digital signatures are more secure than a simple generic electronic signature.