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Java Card enables smart cards and other tamper-resistant security chips to host applications that employ Java technology. It offers a secure, interoperable execution platform to store and update multiple applications on a resource-constrained device, with the highest certification and compatibility.

A smart card is a device that includes an embedded integrated circuit that can be either a secure microcontroller or equivalent intelligence with internal memory or a memory chip alone. The card connects to a reader with direct physical contact or with a remote contactless radio frequency interface.

"Smart Card" basically means a processor card with a SoC that includes a full CPU. Java Card runs on top of a Smart Card. A native smart card is generally thought of as a smart card which contains a runtime that uses "native" processor instructions.

Many smart cards include a pattern of metal contacts to electrically connect to the internal chip. SIM card is a tiny computer in itself it communicate with the embedded computer in the mobile phone. The tiny SIM computer contains public-private key cryptography but it is very difficult to extract the key from the SIM.

Smart cards can provide personal identification, authentication, data storage, and application processing. Applications include identification, financial, public transit, computer security, schools, and healthcare. Smart cards may provide strong security authentication for single sign-on (SSO) within organizations.

For smart card issuers, it delivers a secure and interoperable platform that can be used to store and update multiple applications on a single end-user device. Java Card technology is used in a wide range of smart card applications, including: Smart ID badges for logical and physical access to enterprise resources.