what is the difference between gift card and voucher in samsung Hub of samsung galaxy s4?

Samsung Hub is a central marketplace designed to provide access to a variety of mobile content, such as games, books, music, and videos. Samsung Hub works in conjunction with your Samsung account, so all purchases of content are linked to the Samsung account you signed in to on your device.

You can purchase content in Samsung Hub by using Samsung Hub gift cards or coupons and vouchers that is present in payment method. The major difference between gift cards and vouchers is that in Samsung Gift Card, you can use any remaining balance on additional purchases inside the Samsung Hub but Vouchers are only valid for specific content or promotions inside Samsung Hub.