An RFID reader is a device that uses radio waves to communicate with RFID tags. These tags contain small chips that store information, which the reader can access when it comes within range. RFID readers are commonly used in various applications, such as inventory management, access control, and tracking items in supply chains. The technology works by emitting a radio signal that activates the RFID tag, allowing it to transmit its stored data back to the reader. This process is quick and efficient, enabling businesses to automate data collection and improve accuracy in tracking products or assets.