A duì huàn quàn (redemption voucher) is a physical or digital certificate that entitles the holder to exchange it for a specific good, service, or currency at a designated location or time. The word combines three characters: duì (to match, offset, or settle), huàn (to exchange or swap), and quàn (voucher or coupon). Together, they emphasize the formal, authorized nature of the exchange — not just any trade, but one governed by pre-set terms.

This term is commonly used in banking (e.g., foreign currency exchange vouchers), retail promotions (e.g., loyalty points converted to discount vouchers), and event ticketing (e.g., e-vouchers redeemed for physical tickets). Unlike casual terms like coupon (yōu huì quàn), a duì huàn quàn implies an official, often one-time, conversion process requiring verification or expiration management.