For example, it can be used by:
• Google Play Books to “Read Aloud” your favorite book
• Google Translate to speak translations aloud so you can hear the pronunciation of a word
• TalkBack and accessibility applications for spoken feedback across your device
• ... and many other applications in Play Store
To use Google Text-to-speech on your Android device, go to Settings > Language & Input > Text-to-speech output. Select Google Text-to-speech Engine as your preferred engine.
Note, on many Android devices, Google Text-to-speech is already turned on, but you can update to the latest version here.
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