A CPU-9 card is a high-security smart card with a microprocessor, more advanced than standard IC/ID RFID cards, and typically used in secure authentication and payment systems.

Key Features of CPU-9 Cards:

1. Dual-interface (can be contact or contactless).

2. Multiple applications (can store several apps like payment + ID + transit in one card).

3. High security with cryptographic modules.

4. Large storage compared to simple IC cards.

5. Widely used in national ID, banking, transportation, SIM cards, toll systems.

6. ISO14443 (contactless)