Generally speaking, an electronic signature is an electronic signature of an electronic document through cryptographic technology, not a digital image of a written signature. It is similar to a handwritten signature or seal, or it is an electronic seal. Electronic signature refers to the data contained in the data message in electronic form and attached to identify the identity of the signer and show that the signer approves the contents. E-signing electronic contract is an agreement between two or more parties to establish, change and terminate the property civil rights and obligations through electronic information network.