A voucher is a piece of evidence that acts on behalf of money. They are used for availing discounts or procuring consumables without paying any money. Vouchers are bought or they are granted as gifts. You must be quite familiar with lunch discount coupons or coupons code. These vouchers are usually offered by companies for their employees. So we can treat vouchers as something that has a definite face value and that can be exchanged in return for goods or services.