What is the significance of requiring documents to be signed and sealed at the same time? What does the light signature stand for, and what does the light seal stand for?

Signature and seal have the same effect, that is, the parties confirm the content and effect of the contract or document. Generally speaking, signature or seal is legally effective, but some contracts stipulate that signature and seal are effective and must be in accordance with the contract. In addition, when the unit is the main body of the contract, it is generally necessary to affix the official seal of the unit.