www.tobinoconnor.com/why-you-should-never-breach-your-district-of-columbia-contract/ contracts must be signed for everything, for legal, banking, property and institutional reasons. Therefore, contracts that are legal by default are not necessary for any contract to be considered legal. Contracts not concluded are valid when they are concluded, as they meet all the conditions of application provided for in Article 10 of the Law and are binding on the parties, but are then cancelled for impossibility of performance. Such contracts are not applicable in the eyes of the law: in an agreement not concluded, essential elements of a contract are missing, including, inter alia, consideration, offer, acceptance and contractual capacity. Therefore, the treaty does not exist and is not recognized under the contract law that prevails in different countries around the world. On the other hand, all the necessary elements of a contract can be identified at the outset, making it a valid contract. However, the contract becomes questionable because the agreement of one of the parties to the contract is not free. The illegality has probably been committed or a party feels that they will not benefit from the contract, making it a void contract. A void contract is not enforceable, which means that neither party has recourse against the other party for infringement. A contract can be cancelled from the outset or be cancelled due to certain circumstances, including: under the legal provisions, there is a durability period in the legal obligations when a contract is questionable. Everything is crystall and clearly mentioned in the treaty. The importance of the challenge simply means that the incoming party, by its power, can nevertheless denounce the agreement by mutual agreement.