Law of Contracts: Meaning, Nature and Important Definitions

The law of contracts forms the backbone of commercial and civil transactions in India. Everyday transactions such as purchase of goods, employment arrangements, insurance policies, construction agreements and service contracts are governed by the principles laid down under the Indian Contract Act, 1872. The Act provides clarity on how agreements are formed, when they become legally binding, and in what circumstances they may be enforced or declared void.

A clear understanding of the meaning, nature and essential definitions under the Act is fundamental for students of law and for understanding civil obligations in general.

Nature and Scope of Contract Law

Contract law regulates promises that the law will enforce. It determines the circumstances in which a promise becomes legally binding. The famous jurist Anson described the law of contract as that branch of law which determines the circumstances in which a promise shall be legally binding on the person making it.

The nature of contract law is primarily:

• Voluntary – Obligations arise from the free consent of parties.
• Civil in nature – Breach leads to civil consequences such as damages, not criminal punishment (except in special statutes).
• Based on mutuality – Rights and obligations arise between parties.
• Enforceable by law – Courts recognise and enforce valid contracts.

In simple terms, contract law ensures that promises which satisfy certain legal requirements are enforceable in a court of law.

Meaning of Contract under the Indian Contract Act, 1872

Section 2(h) of the Indian Contract Act defines a contract as:

“An agreement enforceable by law is a contract.”

This definition highlights two essential components:

Contract = Agreement + Enforceability

An agreement alone is not sufficient. It must also be legally enforceable.

For example, if X agrees to construct a house for Y and Y agrees to pay Rs. 10 lakhs in return, and all legal requirements are fulfilled, the agreement becomes a contract because it is enforceable by law.

Thus, every contract begins with an agreement, but every agreement does not become a contract.

Meaning of Agreement

Section 2(e) of the Act defines agreement as:

“Every promise and every set of promises, forming the consideration for each other, is an agreement.”

This can be expressed as:

Agreement = Promise + Consideration

An agreement arises when one party makes a promise and the other party provides consideration in return.

However, the law does not enforce all agreements. Social and domestic arrangements are generally not treated as contracts.

Case Law: Balfour v. Balfour (1919)

In Balfour v. Balfour, a husband promised to send a monthly allowance to his wife while she stayed in England. Later, the parties separated and the wife claimed the amount as a contractual obligation. The court held that there was no intention to create legal relations. The promise was a domestic arrangement and not enforceable as a contract.

This case established the principle that intention to create legal relations is essential for a valid contract.

Essential Elements of a Valid Contract

Although Section 2(h) provides a definition, the Act read with judicial interpretation establishes essential elements:

• Offer or proposal
• Acceptance
• Lawful consideration
• Intention to create legal relations
• Free consent
• Competency of parties
• Lawful object
• Not expressly declared void

If these elements are satisfied, the agreement becomes legally enforceable.

Classification of Agreements

Agreements may be classified into different categories based on their enforceability:

Valid Agreements

A valid agreement is enforceable by law. It satisfies all essential requirements of a contract.

Void Agreements

A void agreement is not enforceable by law. It has no legal effect from the beginning or becomes unenforceable later. Section 2(g) defines a void agreement as one which is not enforceable by law.

Voidable Agreements

A voidable agreement is enforceable at the option of one party. If consent is obtained by coercion, fraud, misrepresentation or undue influence, the aggrieved party may either rescind or affirm the contract.

Illegal Agreements

Illegal agreements are those forbidden by law or opposed to public policy. Such agreements are void and may also attract penalties.

Unenforceable Agreements

An unenforceable agreement is one which cannot be enforced due to technical defects, such as absence of required writing or stamp. If the defect is cured, it may become enforceable.

This classification helps in determining the legal status of an agreement.

Meaning of Promise

Section 2(b) states that when the person to whom the proposal is made signifies assent, the proposal becomes a promise.

Thus, an accepted offer becomes a promise.

Promises may be of different kinds:

Express Promise

Under Section 9, when proposal or acceptance is made in words, whether spoken or written, it is an express promise.

Implied Promise

When proposal or acceptance is inferred from conduct, it is an implied promise.

Reciprocal Promise

Section 2(f) defines reciprocal promises as promises forming consideration for each other. In most contracts, obligations are mutual.

Alternative Promise

Under Section 58, an alternative promise gives a choice between two performances.

The concept of promise is central because it forms the foundation of contractual obligations.

Consideration under the Indian Contract Act

Consideration is defined under Section 2(d). It states that when, at the desire of the promisor, the promisee or any other person has done or abstained from doing something, or promises to do or abstain from doing something, such act or abstinence is called consideration.

In simple terms, consideration is something in return for a promise.

Essential Features of Consideration

• It must move at the desire of the promisor.
• It may move from the promisee or any other person.
• It may be past, present or future.
• It must be lawful.

Consideration distinguishes a binding contract from a mere gift or moral obligation.

Case Law: Kedarnath Bhattacharji v. Gorie Mahomed (1887)

In Kedarnath Bhattacharji v. Gorie Mahomed, a subscription was promised for construction of a Town Hall. Acting on the promise, the plaintiff entered into a contract with a contractor. The defendant later refused to pay. The court held that the defendant was liable because the plaintiff had acted at the desire of the promisor. The promise became binding once action was taken on its basis.

This case emphasised that once consideration has moved at the desire of the promisor, the promisor cannot withdraw the promise arbitrarily.

Types of Contracts

Contracts may also be classified on the basis of formation and performance.

Adhesion Contracts

These contracts are drafted by one party with stronger bargaining power. The weaker party has little or no negotiation power. Insurance policies and standard form contracts are common examples.

Aleatory Contracts

These contracts depend on the happening of an uncertain event. Insurance contracts fall under this category because liability arises upon occurrence of a specified risk.

Bilateral Contracts

In bilateral contracts, both parties make promises to each other. Each party is both promisor and promisee.

Unilateral Contracts

In unilateral contracts, only one party makes a promise. The other party performs an act without making a counter-promise.

Express Contracts

Terms are clearly stated, either orally or in writing.

Implied Contracts

Terms are inferred from conduct or circumstances. For example, when a person consults a doctor, an implied contract arises for medical services.

Void and Voidable Contracts

Void agreements are invalid from the beginning. Voidable contracts are valid until rescinded by the aggrieved party.

Quasi-Contracts

Quasi-contracts are not real contracts based on agreement. They are obligations imposed by law to prevent unjust enrichment. Salmond described them as obligations which are not contractual in truth but are treated as if they were contractual.

Meaning of Proposal or Offer

Section 2(a) defines proposal as the expression of willingness by one person to do or abstain from doing something with a view to obtain the assent of another.

The person making the proposal is called the offeror or promisor. The person accepting it is called the offeree or promisee.

Without a valid proposal, there can be no contract.

General Offer and Invitation to Treat

An offer may be made to a specific person or to the public at large.

General Offer

A general offer is made to the world at large and can be accepted by anyone who fulfils its conditions.

Case Law: Carlill v. Carbolic Smoke Ball Co.

The company advertised that it would pay £100 to anyone who used its product as prescribed and still contracted influenza. The plaintiff complied and fell ill. The court held that the advertisement was a general offer. By performing the conditions, the plaintiff accepted the offer. A binding contract was formed.

This case established that a general offer can result in a contract when accepted by performance.

Invitation to Treat

An invitation to treat is not an offer but an invitation to make an offer.

Case Law: Pharmaceutical Society of Great Britain v. Boots Cash Chemists Ltd.

The court in Pharmaceutical Society of Great Britain v. Boots Cash Chemists Ltd held that display of goods with price tags in a shop is merely an invitation to treat. The customer makes the offer when presenting goods at the counter. The shopkeeper may accept or reject it.

This distinction prevents automatic contractual liability merely by display of goods.

Mistake and Void Contracts

When both parties are under a mistake as to a matter of fact essential to the agreement, the contract becomes void.

In an 1887 Calcutta case (ILR 14 Cal 64), it was held that earnest money cannot be forfeited where the contract was void due to mutual mistake. A void contract creates no enforceable rights.

Conclusion

The law of contracts under the Indian Contract Act, 1872 provides a structured framework governing agreements and obligations. A contract is not merely a promise but an agreement enforceable by law. The distinction between agreement and contract is crucial. Essential elements such as offer, acceptance, consideration and intention to create legal relations determine enforceability.

Judicial decisions such as Balfour v. Balfour, Kedarnath Bhattacharji v. Gorie Mahomed, Carlill v. Carbolic Smoke Ball Co. and Pharmaceutical Society v. Boots have shaped the interpretation of statutory provisions.

Understanding the meaning, nature and important definitions under contract law is fundamental for appreciating how civil obligations arise and are enforced. The Indian Contract Act continues to remain a cornerstone of commercial and private legal relationships in India, providing certainty, fairness and enforceability to voluntary agreements.

Note: This article was originally written by  Ankur Srivastava [Student, ICFAI Law School, Hyderabad] on 27 December 2020. It was subsequently updated by the LawBhoomi team on 24 February 2026.