TalkBack is an Accessibility Service that helps blind and vision-impaired users interact with their devices.Talkback adds spoken, audible, and vibration feedback to your device. It is a system application that was pre-installed on most devices and is updated when the accessibility service is improved.
For help with Talkback, see: https://support.google.com/talkback/
This app is only activated if you explicitly turn on Accessibility.Steps to activate Accessibility:1. Go to Settings2. Select Accessibility
(Android 3.2 and earlier)3. Enable Accessibility checkbox4. Enable TalkBack checkbox
(Android 4.0)3. Select TalkBack and enable the switch4. Select back and enable explore-by-touch
(Android 4.1 and above):3. Select TalkBack and enable the switch