The NFC Forum was formed to advance the use of Near Field Communication technology by developing specifications, ensuring interoperability among devices and services, and educating the market about NFC technology.
The NFC Forum has mandated five tag types to be operable with NFC devices. This is the backbone of interoperability between different NFC tag providers and NFC device manufacturers to ensure a consistent user experience.
This means that if an NFC tag is NFC Forum Type 1, Type 2, Type 3, Type 4 or Type 5, it complies to the NFC Forum specifications. NFC Forum compliant NFC tags typically have less compatibility issues than non-NFC Forum certified NFC tags such as the Mifare Classic.