This is a smart card. It contains a microchip that has the ability to compute cryptographic algorithms. An enlarged photo of the chip is seen below the card. Most of these chips use algorithms called RSA or Triple DES. These cards are beneficial because they provide much more security than other cards. They also serve purposes other than being used to buy things. They can help access personal information securely. I find it cool that such a small chip has the power to solve such algorithms.
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