The discount voucher formalizes a commercial promise: "by presenting this voucher, you benefit from X". Common formats:

In practice, this mainly covers alphanumeric codes (e.g. WELCOME15) in an email or a promo banner; printable coupons with QR codes or barcodes scannable in-store or online; paper vouchers inserted in a package (customer service, loyalty, referral); and unique single-use vouchers generated by CRM or loyalty apps.

Useful distinctions:

In practice, this mainly covers discount voucher vs. promo code: the voucher is the medium or the entitlement; the promo code is the technical mechanism entered in the shopping cart. In practice, the terms overlap; discount voucher vs. discount: the discount is the discount rule in Shopify; the voucher is its customer distribution; discount voucher vs. gift card: the gift card has a prepaid monetary value; the voucher grants a discount on the order (often % or amount); discount voucher vs. coupon: coupon is the equivalent Anglo-Saxon term (often digital); and displayed discount vs. voucher: crossed-out price on the product sheet = open promotion; voucher = conditional benefit (code, date, minimum cart amount).

The discount voucher must be considered as a commercial management tool, not as an improvised discount. Its configuration determines whether it actually stimulates the purchase or whether it unnecessarily reduces profitability.