Principle: When a person who has made a promise to another person to do something does not fulfill his promise, another person becomes entitled to receive, from the person who did not fulfill his promise, compensation in the form of money.

Facts: X made a promise to Y to repair his car engine. Y made the payment for repair. After the repair, Y went for a drive in the same car. While driving the car, Y met with an accident due to bursting of the tyre.