Signature doesn't have to be signed and sealed. For example, the signature in negotiable instrument law includes signature, seal or signature and seal. The specific connotation of the signature can be determined by the parties to the contract, and can also be determined in accordance with industry practices and trading habits.

Should the signature and seal be available at the same time or one of them can be considered valid. Signature means that the signature and seal are in a parallel relationship, and the agreement can only take effect if there are both signatures and seals. Signature or seal is a selective relationship, that is, signature, seal or both can be used at the same time. These three situations have the same significance for the establishment of the contract.

Signature is a general term for signature and seal. That is, the name of the party or the name of the unit is stamped. Its function is to show seriousness and fairness, which means "double insurance". At the same time, if an accident occurs, the operator's responsibility can also be investigated by signing. For example, what kind of certificate do you need to issue? If the party concerned is serious, he will sign his name and affix the official seal of the company when issuing the certificate to you. In this way, if there is any doubt about the certificate, or the certificate is not true, the other party can directly know the situation from the signatory and investigate the relevant responsibilities.

Legal basis:

People's Republic of China (PRC) Civil Code

Article 490 Where the parties conclude a contract in the form of a contract, the contract is formed when the parties sign, seal or fingerprint it. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.

A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.

Article 7 Signature of a negotiable instrument The signature on a negotiable instrument is signature, seal or both.

The signature of the legal person or other organization that uses the bill shall be the signature of the legal person or other organization plus the signature of its legal representative or its authorized agent.

The signature on a bill of exchange shall be the real name of the party concerned.