voice control

(Figure: Apple's "Siri")

Voice control is an accessibility feature designed for people with physical disabilities, allowing them to use information captured from a device's built-in microphone as data.

The use of voice means that there is no need to move your arms or legs, and this is one of the main advantages of it, most recently known for Apple's Siri and Google's "OK, Google".

It is sometimes referred to as a Voice User Interface (VUI).