NFC tags are small, wireless devices that use Near Field Communication technology to transmit data over short distances, typically a few centimeters. They can store information like URLs, contact details, or product information, making them useful for various applications, such as marketing, payments, and access control. To use an NFC tag, a compatible device, like a smartphone, must be brought close to the tag. This interaction allows the device to read the stored data or perform specific actions, such as opening a website or adding a contact. NFC tags are often found in stickers, cards, or embedded in products.