Belt. Word document is a format of electronic document (suffix named docx), and the software to open this format document is called Word. Its main function is that users can use computer software to write and edit some documents. Word20 13 is a member of Microsoftoffice20 13, which is mainly used for word processing of electronic seals. Electronic signature is a form of electronic signature. Image processing technology is used to transform the electronic signature operation into the same visual effect as the stamping operation of paper documents, and electronic signature technology is used to ensure the authenticity and integrity of electronic information and the non-repudiation of signers.