Carding means that a credit card number is used to charge pre-paid cards. Carding involves a carder, which can be a person or a service such as Feccshop or Feshopcc, purchasing gift cards, which can be used to buy goods online, transferred to others through different forums or sold for cash
Carders often don't know the validity of credit card numbers, and hence they need bots to create the correct list. After getting the list of valid numbers, carders, including Carddumps and Dumpsbuy, can sell or cash them out.
Target for carders
Most developed countries are a target for carders because they're large markets in which credit cards are common.