In the conception of the Portuguese Central Bank (2009, N.P.) banking card is defined as: ... a payment instrument, generally under the form of a plastic card, disponibilizado for the entity drawer to the bearer so that this, through the access to a net of telecommunications and on the basis of the account the one that the card is associated, acquires good or services, effect payments, proceed the surveys from notes and/or carry through other operations. The Smart card bank clerk can also be understood as a card that if resembles in form and size to a conventional credit card of magnetic plastic with tarja, differentiating itself of this for chip that it is inlaid in the same. Worcman, colunista of Interesting the Super magazine (1998, ed. 126), summarize the concept redefining it as one ' ' intelligent card that comes with one chip capable to process dados' '. The site Clear Online (2009) describing on the regulation of the card of chip, it defines with a card that serves to carry through transactions, in these inserted monetary units or other data of values, that represent not monetary rights that are transferred between the user and the supplier of services or are presented to the supplier of services for verification of the rights, being that the card of chip understands a memory, in which the data necessary to carry through the transactions are stored. It can also be appraised as an existing device in the credit cards that possess the function to add more security in the purchase transactions and booties. Another definition says that, is a card that contains one chip that it generates and it stores digital certificates, that is, information that say who you are. How much to chip, the Portuguese Central Bank defines it as one ' ' electronic device that supports information associated with the bearer, entity drawer and type of card in which is inserted and that it allows, normally, reading modification of the constant elements in it.