违约责任,是指合同当事人不履行或不适当履行合同约定或法定义务所应承担的损害赔偿、支付违约金、解除合同等民事责任。其主要特征是:1、违约者人的性质是一种民事责任,不是行政责任、刑事责任;2、违约责任是在合同依法成立之后,履行合同过程中的民事责任,而不是签订合同之前和签订合同过程中所产生的缔约过失责任,其为先契约责任,而不是契约的违约责任;3、违约责任的产生基于合同一方或双方不履行合同义务的事实,第三人的行为不构成合同双方当事人的违约责任;4、违约责任是 Liability for breach of contract means that the parties to the contract do not perform or improperly perform the contractual obligations or statutory obligations should bear the compensation for damages, liquidated damages, the contract to terminate the civil liability. Its main features are: 1, the nature of the person who defaulted is a civil liability, not an administrative responsibility, criminal responsibility; 2, breach of contract responsibility is the civil liability in the contract process after the contract was established according to law, rather than before the signing of the contract and The contractual negligence arising in the process of signing the contract, which is the first contractual responsibility, rather than the contractual liability for breach of contract; 3, the liability for breach of contract based on the contract or both parties to fulfill the contractual obligations of the fact that the third party’s behavior does not constitute a contract both parties The party’s liability for breach of contract; 4, liability for breach of contract is