Smart cards are credit card sized plastic cards with embedded integrated circuits and chips that conform to ISO 7816 standards. They are used for applications that require high security and authentication, including credit and debit cards, medical cards, identification cards, entertainment cards, and voting cards. Common uses of smart cards include secure user authentication for computers and networks, encryption of sensitive data, subscription information for satellite TV receivers, pre-paid phone cards, storing patient healthcare histories, and electronic ticketing for public transportation, parking, and road tolls.