The nfc tag is a small chip that can be erased and inputted. Through the nfc tag, it can communicate with the mobile phone or computer with nfc function to identify and scan the input at close range. NFC tags are developed on the basis of non-contact radio frequency identification (RFID) technology combined with wireless interconnection technology. It provides a very safe and fast communication method for various electronic products that are becoming more and more popular in our daily life. The working frequency of NFC electronic tags is 13.56MHz, and the working distance is theoretically 0~20cm. However, in the realization of the product, due to the use of special power suppression technology, the working distance is only 0~10cm. Writing equipment has a lot to do with it, so as to better ensure the security of the business, and it is mostly used in access control, bus cards, mobile payment and other fields.

One of the main application scenarios of NFC technology is NFC mobile phone reading and writing NFC tags, and the "tag" mentioned here is actually just a general term. In practical applications, "NFC tags" are not just like stickers. According to different application scenarios, there can be Many different external forms. Some are suitable for sticking on the surface of objects, some are suitable for embedding inside objects, and some are suitable for carrying around.