Wikipedia
MIFARE
MIFARE is the NXP Semiconductors-owned trademark of a series of chips widely used in contactless smart cards and proximity cards.
The MIFARE name covers proprietary technologies based upon various levels of the ISO/IEC 14443 Type A 13.56 MHz contactless smart card standard. According to MIFARE themselves, 10 billion of their smart card chips and 150 million of their reader modules have been sold. The technology is owned by NXP Semiconductors, which was spun off from Philips Electronics in 2006.