The Concept of NFC The full name of NFC is Near Field Communication, short-range wireless communication. NFC is a wireless technology initiated by Philips and jointly promoted by Nokia, Sony and other famous manufacturers. NFC is developed on the basis of non-contact radio frequency identification (RFID) technology combined with wireless interconnection technology. This technology is initially just a simple merger of RFID technology and network technology, has now evolved into a short-range wireless communication technology, and its development trend is quite rapid. The Concept of RFID RFID is the abbreviation of Radio Frequency Identification, also known as electronic tag, which is a contactless automatic identification technology. It identifies a specific target through radio signals and reads and writes relevant data without mechanical or optical contact with the target. It does not require manual intervention, can be used in various harsh environments, can identify high-speed moving objects, can identify multiple tags at the same time, and the operation is fast and convenient. The Difference between NFC and RFID Different Frequency Range RFID operating frequency is relatively wide. Commonly used are 125KHZ and 133KHZ (low frequency), 13.56MHZ (high frequency), 900MHZ (ultra-high frequency), 433MHZ, 2.4G, 5.8GMHZ (microwave frequency). In addition, UHF 900M is also a general term, not an exact one. Frequency also varies from country to country. For example, the European frequency band (865.6MHZ-867.6MHZ), Singapore (920MHz~925MHz), China (920.5MHZ-924.5MHZ or 840.5MHZ-844.5MHZ), the United States (902M-928M), Brazil (902M-907.5M or 915M- 928M), etc. The operating frequency of NFC is only 13.56MHZ.We can even understand NFC as a subset of RFID technology, which uses the 13.56MHz band is the specific frequency band of HF RFID. The application of this frequency band is very popular, and it involves a variety of protocols. But 13.56MHZ does not mean that all equivalent to NFC. Different Transmission Distance Because RFID has a large operating frequency span, the transmission distance at different frequencies is also different. The short one is a few centimeters, and the long one can reach several meters or even tens of meters. NFC is a short-distance communication technology. As the name suggests, the transmission range is relatively short, usually within 20cm, so that the communication will be safe. This is mainly due to the unique signal attenuation technology adopted by NFC, which has the characteristics of short distance, high bandwidth and low energy consumption. Different Communication Technology The entire RFID communication system consists of RFID tags, antennas and RFID readers, all of which are indispensable. The system needs read and judge the tag information unidirectionally through the reader. NFC integrates reader, contactless card and point-to-point functions into a single chip, and two mobile phones or wearable devices with built-in NFC control can realize information interaction at close range. The difference in communication technology is the biggest difference between the two. NFC is a short-distance private communication method. These differences also lead to differences in their applications. From the perspective of application scenarios, it can be seen that there are obvious differences between RFID and NFC. RFID is object-centric, while NFC is user-centric and requires the participation of users to achieve functions. RFID realizes the reading and judgment of information, while NFC technology emphasizes information interaction with more flexible and bi-directional. In practical applications, RFID can enable a reader to read a large number of RFID labels at the same time, which is extremely common in warehouse inventory. RFID is often used in logistics, retail, aviation, medical, asset management. The second-generation ID cards and Beijing Olympic tickets all have built-in RFID chips, and the ETC electronic non-stop toll collection system on the expressway also uses RFID technology. NFC is generally one-to-one, and the transmission range of NFC is much smaller than that of RFID. Therefore, NFC plays a huge role in the fields of access control, public transportation, and mobile payment. In fact, RFID's application scenario is much broader than NFC, and it can even be said that RFID contains NFC. However, due to the differences in functional characteristics between RFID and NFC, the two basically do not constitute a competitive relationship, but play a role in their respective adapted scenarios. No matter what technology is used, the biggest challenge is often to think about how to improve the user experience and bring real convenience to users.