Prepaid debit cards belong to some of the major card networks such as Visa, Mastercard, American Express, and others. As long as you have preloaded the card with money, you can use it for shopping at stores and online where they accept these card networks. You can use your card domestically and abroad if the merchants accept these card networks, but keep in mind that you will be subject to currency conversion if you use your card abroad. Depending on the card you choose, your card might only be valid in certain stores. A shopping prepaid debit card that you get from a store is typically only for in-store purchases, so you can only use it at the said store chain and at some of its partner locations.