Meaning :

A voucher is a document or code that allows you to get a discount, redeem a  product, or confirm payment.

Example:  For instance, a ₹200 Amazon voucher can be used to lower the final bill when  buying anything from Amazon.

How to Understand :  

It’s like prepaid money or a discount coupon that you can use when purchasing goods or  services.

Importance :

Vouchers help reduce costs when buying items.

They are often used in businesses for accounting and reimbursements.

Vouchers encourage planned and purposeful shopping, helping you save money.

They are also useful for gifting, allowing you to give someone a special treat.