Passive RFID (Radio Frequency Identification) is a technology that uses small tags to identify objects without needing a power source. These tags contain a chip and an antenna, which receive energy from a nearby RFID reader's radio waves. When activated, the tag transmits its stored information back to the reader, allowing for automatic identification and tracking of items. Unlike active RFID tags, which have their own battery, passive RFID tags rely entirely on the energy from the reader. This makes them smaller, lighter, and more cost-effective, making them ideal for applications in inventory management, supply chain logistics, and asset tracking.