When someone consents to perform an action or to refrain from one, they are creating a promise. Promises may be spoken aloud or recorded in writing; a written pledge can take the form of a document such as a contract. Failing to honour a promise is often considered impolite or untrustworthy, but in some situations—particularly where a formal contract exists—it can have legal consequences.

Common kinds of promises

  • Vows: These are solemn promises frequently made in religious contexts or formal ceremonies. For example, people often exchange marriage vows, pledging fidelity and support to one another.
  • Oaths: An oath is a pledge taken within legal or official settings. A person who is called to give evidence in court typically swears an oath, committing to tell the truth.
  • Informal promises: everyday assurances made between friends, family members, or colleagues that are usually enforced by social norms rather than law.

Not all promises carry the same weight. Contracts and oaths are backed by legal systems and may be enforceable in court. Other pledges rely on personal reputation, cultural expectations, or moral obligation. When a formal agreement is breached, remedies can include damages, specific performance, or other legal sanctions; when a social promise is broken, the consequences tend to be loss of trust or damaged relationships.

Why promises matter

Promises help coordinate behavior, build trust, and underpin many social and legal institutions. Whether expressed casually or through formal instruments, they reduce uncertainty by creating expectations about future actions.