What is the difference between a sales contract and a purchase c

What is the difference between a sales contract and a purchase contract,and between a contract and a confirmation?
【正确答案】：The different between a sales contract and a pur- chase contract is that a sales contract is made by the seller,and a purchase contract is made by the buyer. The difference between a contract and a confirmation is that a confirmation is less detailed than a contract, covering only the essential terms of the transaction.