Beacons are small devices that use Bluetooth technology to transmit signals to nearby smartphones and other devices. They are often used in retail stores, museums, and airports to provide location-based information and services. When a device comes within range of a beacon, it can receive notifications, promotions, or guidance, enhancing the user experience. These devices work by broadcasting a unique identifier that can be picked up by compatible apps on smartphones. Beacons can help businesses engage customers more effectively and improve navigation in large spaces, making them valuable tools in the growing field of location-based services.