DEF: A document that you can give to someone as gift and that person can use it to buy something in a store, instead of paying with money.
EX: I don’t know what present to buy for him this Christmas; I’ll give him a gift card instead, he can use it to buy what he really likes.
Merriam-Webster Online Dictionary
gift card (noun) a card entitling the recipient to receive goods or services of a specified value from the issuer
