A counter-signature is made to confirm that the act or provisions of the document have been approved by both the signatory and the other party concerned. If two parties sign a contract, the first will sign, then the second will oppose to confirm its approval of the contract. If two separate parties sign a contract, the first one signs. The second party will then oppose to ensure its approval of the treaty. Countersignments are common in almost all business incidents. Most legal documents must be undersigned and countersigned, but signatures only apply to what is in the treaty at the time of signing. Amendments to a contract, which will be added later, must also be signed and countersigned, or cannot be maintained legally. In addition, a payment order or other financial instrument may be signed once after receipt and then re-signed by the same person when it is subject to payment, indicating that the holder is the same person who originally received the item, and not a thief who stole the item before it could be transported to the scene, in which it should be presented. A countersigned contract is a very useful tool that you have probably signed several times without realizing it. .