S Voice is a built-in application present in Samsung Galaxy mobile phones which works like a personal assistant. You just need to speak and it'll answer your questions and perform various tasks.
Did you know, you can launch S Voice application directly by pressing the Home button twice? Just double tap on the Home button present on your mobile phone and it'll launch S Voice app directly.
If you want to disable this action, launch S Voice using double tap on Home button, then open its settings and uncheck "Open via the home key" option.
