Contractual law is a fundamental legal discipline whose current evolutions are multiple. A contract is an agreement of will giving rise to one or more obligations between two natural or legal persons.
In some cases, the parties are restricted by legal requirements to be respected, such as form, protection of consent or prohibition of excessive commitments.
The contract gives rise to an obligation, which the parties must respect. The parties are the ones who can demand a certain product or service from the contract.