Voice input is a way to control a system by speaking instead of typing. Speech is first captured as audio, then processed by recognition software that turns it into text or direct commands. In practice, this is an interpretation layer: the system is not just hearing words, it is deciding what action those words should produce.
This matters in cyber security because every new input path changes trust and control. If recognition is wrong, a harmless phrase can become an unsafe command. If the microphone is always listening, users may not notice when audio is captured or sent to a local or cloud service. Attackers can exploit that by using spoofed speech, background audio, or social engineering to trigger unwanted actions. Defenses include push-to-talk controls, visible recording indicators, permission checks, confirmation before sensitive actions, and logging of recognized commands. Used carefully, voice input can improve accessibility and hands-free workflows without weakening security.