Meaning :

A voucher refers to a document or code that provides a discount, allows you  to redeem a product, or confirms a payment.

Example:  For example, using a ₹200 Amazon voucher can decrease the total bill when  purchasing items from Amazon.

How to Understand : 

A voucher acts like prepaid money or a discount coupon that can be utilized during  purchases of goods or services.

Importance :

Vouchers help in reducing costs, making purchases more affordable.

They are frequently used in business settings for accounting purposes and  reimbursements.

Vouchers promote planned and purposeful shopping, encouraging thoughtful spending.

They are also practical for gifting, providing a way to give someone a choice in their  purchases.