Explanation:

A voucher is a bond of the redeemable transaction type which is worth a certain monetary value and which may be spent only for specific reasons or on specific goods. Examples include housing, travel, and food vouchers. The term voucher is also a synonym for receipt and is often used to refer to receipts used as evidence of, for example, the declaration that a service has been performed or that an expenditure has been made. Voucher is a tourist guide for using services with a guarantee of payment by the agency.

 bill is an  statement of money owed for products sold or for the services that are provided from the seller to the buyer.

A voucher can be described as a written instruction that is used to confirm the deal of goods and services for the specified amount of money.