TalkBack, Kickback, and SoundBack are apps for the Android Accessibility Service to help blind and vision-impaired users use their devices more easily.These apps add spoken, audible, and vibration functionality services to your device. They are system applications that were pre-installed on most device and are updated when the accessibility service is improved.These apps only get activated if you explicitly turn on Accessibility.Steps to activate Accessibility:1. Go to Settings2. Select Accessibility3. Enable Accessibility checkbox4. Enable TalkBack, KickBack, SoundBack checkboxes