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Branch of private law
The law of obligations is one branch of private law under the civil law legal system and so called "mixed" legal systems. It is the body of rules that organizes and regulates the rights and duties arising between individuals. The specific rights and duties are referred to as obligations, and this area of law deals with their creation, effects and extinction. An obligation is a legal bond (vinculum iuris) by which one or more parties (obligants) are bound to act or refrain from acting. An obligation thus imposes on the obligor a duty to perform, and simultaneously creates a corresponding right to demand performance by the obligee to whom performance is to be tendered.

The word originally derives from the Latin "obligare" which comes from the root "lig" which suggests being bound, as one is to God for instance in "re ligio". This term first appears in Plautus' play Truculentus at line 214. Obligations did not originally form part of Roman Law, which mostly concerned issues of succession, property, and family relationships. It developed as a solution to a gap in the system, when one party committed a wrong against another party. These situations were originally governed by a basic customary law of revenge. This undesirable situation eventually developed into a system of liability where people were at first encouraged and then essentially forced to accept monetary compensation from the wrongdoer or their family instead of seeking vengeance. This signaled an important shift in the law away from vengeance and towards compensation. The state supported this effort by standardizing amounts for certain wrongs. Thus the earliest form of Obligation law derives out of what we would today call Delict. However, it is important to note that liability in this form did not yet include the idea that the debtor "owed" monetary compensation to the creditor, it was merely a means of avoiding punishment. If the debtor or his family didn't have the means to pay then the old rules still applied as outlined in the Twelve Tables, specifically Table III. This section, despite how harsh it may appear to us, was originally developed as a means to protect debtors from the excessive abuses of creditors.

Justinian first defines an obligation (obligatio) in his Institutes, Book 3, section 13 as "a legal bond, with which we are bound by necessity of performing some act according to the laws of our State." He further separates the law of obligations into contracts, delicts, quasi contracts, and quasi delicts. Nowadays, obligation, as applied under civilian law, means a legal tie (vinculum iuris) by which one or more parties (obligants) are bound to perform or refrain from performing specified conduct (prestation). Thus an obligation encompasses both sides of the equation, both the obligor's duty to render prestation and the obligee's right to receive prestation. It differs from the common law concept of obligation which only encompasses the duty aspect. Every obligation has four essential requisites otherwise known as the elements of obligation. They are:
the obligor: obligant duty bound to fulfill the obligation; he who has a duty. the obligee: obligant entitled to demand the fulfillment of the obligation; he who has a right. the subject matter, the prestation: the performance to be tendered. a legal bond, the vinculum juris: the cause that binds or connects the obligants to the prestation.

A contract can be broadly defined as an agreement that is enforceable at law. Gaius classified contracts into four categories which are: contracts consensu, verbal contracts, contracts re, and contracts litteris. But this classification cannot cover all the contracts, such as pacts and innominate contracts; thus, it is no longer used. According to many modern legal scholars, the most important classification of contracts is that of contracts consensu, which only require the consent of wills to create obligations, and formal contracts, which have to be concluded in a specific form in order to be valid (for example, in many European countries a contract regulating the purchase of real estate must be concluded in a special written form that is validated by a public notary).

Quasi contracts are supposed to be sources of obligations very similar to contracts, but the main difference is that they are not created by an agreement of wills. The main cases are negotiorum gestio (conducting of another person's affairs without their authorization), unjust enrichment, and solutio indebiti. This Roman classification is quite controversial for today's standards, since many of these cases would be considered as completely different from contracts (most notably unjust enrichment), and would instead be classified as delicts or special sources of obligations. They are formed by implication from circumstances regardless of the assent or dissent of parties. They are called quasi contracts. The following are the examples of quasi contractual obligations under the Roman law;

The designation comprised a group of actions that are very similar to delicts, but lacking one of key elements of delicts. It includes res suspensae, responsibility for things poured or thrown out of buildings, responsibility of shippers/innkeepers/stablekeepers, and erring judges. For example, the responsibility of innkeepers creates obligations when certain things left by guests in the lodging are destroyed, damaged or lost by the innkeeper's assistants or employees. In this case, the innkeeper is responsible for the damages to the guest's property, even though he did not cause them personally.