Several credit cards have now included RFID technology into the card, for a more quick and convenient payment. With a RFID coin at the credit card, you will be able to just show your card for a payment terminal and no pin-code is needed to proceed the payment.
The downside is that there is a risk that your credit card will be skimmed when it is in your wallet or purse. Someone with a scanner can pass you, for example in the subway, and the scanner can register the account details from your credit card without you even notice it.
The solutions is to protect your credit cards with a RFID Shield, that protects your card from skimming
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