Smartphone-controlled drones are unmanned aerial vehicles that can be operated using a smartphone app. These drones connect to the smartphone via Wi-Fi or Bluetooth, allowing users to control their flight, capture photos, and record videos directly from their devices. Many smartphone-controlled drones are equipped with features like GPS, which helps with navigation and stability. They are popular for recreational use, such as aerial photography and racing, and are also utilized in industries like agriculture and surveillance for monitoring crops and inspecting infrastructure.