Radio-frequency identification (RFID) is a technology that uses radio waves to automatically identify and track tags attached to objects. Each tag contains a microchip with data and an antenna that communicates with a reader. This allows for quick and efficient data collection without the need for direct line-of-sight. RFID is commonly used in various industries, including retail, logistics, and healthcare. It helps improve inventory management, streamline supply chains, and enhance security by enabling real-time tracking of products and assets. The technology can also be found in contactless payment systems and access control systems.