Near-field communication (NFC) is a technology that allows devices to communicate wirelessly when they are very close to each other, typically within a few centimeters. It is commonly used in mobile payments, where smartphones can make transactions by simply tapping them against a payment terminal. NFC operates on a short-range radio frequency, making it secure and efficient for quick exchanges of data. NFC is also used for sharing information between devices, such as transferring files or connecting to Bluetooth devices. Additionally, it can be found in smart cards and contactless tickets, enabling users to access services or transport systems without physical contact.