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Most drones are supplied with a controller which has various options for starting, stopping the drone, controlling the direction in which the drone is flying.
The communication is using a WiFi network
The controller usually has a battery which has to be charged periodically.
Additionally many drone manufacturers also have an app for controlling the drone. The app is compatible with both iOS and Android based systems.
The app allows the user to monitor the drone, control it.
In some cases, the images and videos from the drone are also live streamed to the camera, and can be recorded.
There may be a provision for monitoring the battery of the drone, so that the user is aware that the battery power is low , and ask the drone to return.