Special signature refers to the signature signed by someone personally, which has personal characteristics and uniqueness and is usually used in special occasions or specific documents. Special signature has the characteristics of uniqueness and personal authenticity, and it is often authenticated and has legal effect. Face-to-face signature refers to signing in an ordinary way, which has no special personal characteristics and is more common in ordinary documents, copies of documents or ordinary contracts. Special signs are more valued and cherished because of their uniqueness and personal authenticity.