Difference b/w........

Rebate:an incentive to be given to a customer .clubbed with qty purchased by a customer within the period specified (say one month)-conditional.

Discount:unconditional to be given to a customer on account of heavy purchase by one single billing.-From the price List(Base price).

Rebate is a partial repayment whereas a refund is a repayment of the total purchase price

Discount is reduction in Price