The Contracts must be executed according to their content. Therefore, the parties must fulfill their obligations as stipulated in the contract content. If one of them Do not execute his obligations, his contractual responsibility is to breach the contractual content of his contract.
This principle does not differ in law, but the difference lies in what is wrong or not, as well as different ways to address this breach.
The breach is not limited to the failure of the parties to fulfill the obligations under the contract, but the description of the breach applies to the cases of non-implementation of obligations not mentioned in the contract - secondary obligations - and the liability is also contractual, by virtue of charging the legislator one of the parties to the contract some obligations on the occasion of the original contract, Or as a result of the nature of the contract or as required by the principle of good faith not only the liability of the debtor for the obligations mentioned in the contract, but be responsible for what is the requirements of the contract.
The French legislator has decided on a set of options for the creditor, which, at the same time, is a penalty for the contractor who violates his contractual obligations, as justice requires that anyone harmed by the act should compensate for the damage caused.