An NFC reader is a device that uses Near Field Communication technology to wirelessly exchange data with other NFC-enabled devices. These readers can be found in smartphones, payment terminals, and access control systems. They work by detecting nearby NFC tags or devices when they are brought close together, typically within a few centimeters. NFC readers are commonly used for contactless payments, allowing users to make transactions by simply tapping their card or smartphone on the reader. They also facilitate data sharing, such as transferring files or connecting to Bluetooth devices, making them versatile tools in modern technology.