Sometimes, a text has to be converted into a voice. It can be useful for a personal bot to speak back to a user. 

Let's look at how to use the AWS API for text-to-speech Amazon Polly. With the API, you can pass the text and convert it to speech. The audio file can be either streamed or downloaded.

The voice should be natural sounding, to connect with the user. Google can provide this in 30 different voices, in 12 different languages. The speed and pitch can be adjusted. Go to https://cloud.google.com/text-to-speech/ and try out a demo. The following screenshot shows an example; all of the parameters can be tuned:

The requests can be sent from any connected device, such as a mobile, car, TV, and so on. It can be used for customer service, presenting educational text, or for animation content.