A contract is a legally binding document between at least two parties, which defines and regulates the rights and obligations of the parties to an agreement.  A contract is legally enforceable because it complies with the requirements and approval of the law. A contract usually involves the exchange of goods, services, money or promises from one of them. „breach of contract” means that the law must grant the victim either access to remedies, such as damages, or annulment.  When an obligation comes into effect, the contracts arise on the basis of a commitment made by one of the parties. To be legally binding as a treaty, a promise must be exchanged for an appropriate consideration. There are two different theories or definitions of consideration: the theory of bargains of consideration and the theory of utility-detriment of consideration. Contract law is based on the principle of pacta sunt servanda formulated in indenkisch („Agreements must be respected”).  The Common Law of Contract was born out of the now-disbanded letter of the assumption, which was originally an unlawful act based on trust.
 Contract law is a matter of common law of duties, as well as misappropriation and undue restitution.  An oral contract can also be characterized as a parol contract or oral treaty, „verbal” signing „spoken” and not „in words,” a use established in British English in terms of contracts and agreements, and, more generally, abbreviated in American English as „cowardly”.  (conclusion of a contract – not just an agreement – in the strict sense of the word requires the existence of the three other elements mentioned above: (1) Reflection, (2) with the intention of creating a legally binding contract and (3) contract-compliant capacity) As noted above, both parties must be over 18 years of age and in good health for a contract to be implemented. If this is not the case and insufficient capacity is demonstrated, the contract is unenforceable. The question of capacity usually arises when a party is too young or does not have the mental capacity to understand the agreement and its implications. Since a contract is a legally binding agreement, you might think that a valid contract may be deemed unenforceable; However, there are several reasons why this could happen.