Violation of a contractual obligation by failing to perform ones own promise, by repudiating it, or by interfering with another partys performance. A breach may be one by non-performance, or by repudiation, or by both. Every breach gives rise to a claim for damages, and may give rise to other remedies. Even if the injured party sustains no pecuniary loss or is unable to show such loss with sufficient certainty, he has at least a claim for nominal damages. If a court chooses to ignore a trifling departure, there is no breach and no claim arises.