Java Card is a technology that allows Java applications to run on small, resource-constrained devices such as smart cards, SIM cards, and embedded systems. It provides a secure environment for applications, making it ideal for sensitive operations like authentication, encryption, and payment processing.

Key Features
Small Footprint: Designed to operate with limited memory and processing power.
Security: Offers a robust platform for secure operations, leveraging encryption and tamper-proof storage.
Interoperability: Applications written for Java Card can run on any Java Card-compliant device.
Multitenancy: Supports multiple applications on a single card, isolating them for security.
Use Cases
Banking: Smart cards for secure transactions.
Telecommunications: SIM cards for mobile authentication.
Identity Management: Secure ID cards and access control systems.
Java Card's flexibility and security make it a cornerstone in industries requiring robust, lightweight, and portable computing solutions.