合同,也叫契约,它是双方当事人依法订立的有关权利与义务的协议。它的存在已经有好几千年的历史了,现在仍被人们广泛地应用着。任何组织或个人都要运用这种形式进行经济活动,只不过是自觉或不自觉地运用罢了。就以人们在日常生活中,拿钱到商店买东西这种简单的买卖活动,也都是运用了口头合同这一形式——当事人之间通过对话而成立的合同。对于数量、金额较大,内容比较复杂,不能当时履行的合同,大多数国家的法律 Contract, also known as contract, is an agreement between the parties to legally enforce rights and obligations. Its existence has existed for thousands of years and is still widely used by people. Any organization or individual that uses this form of economic activity is only consciously or unconsciously employed. The simple trade-offs that take people in their daily lives and get money to buy in stores are all forms of verbal contracts - contracts that parties set up through dialogue. For the number of large amount, the content is more complex and can not be performed at the time of the contract, the majority of national laws