Amazon Polly is primarily used for what purpose?

Amazon Polly is primarily designed to convert written text into lifelike speech, making it a powerful text-to-speech service. This capability allows developers to add speech synthesis to applications, enabling voice interaction that enhances user engagement. By leveraging advanced deep learning technologies, Amazon Polly can produce speech that closely mimics human intonation and emotion, rendering it useful for applications such as audiobooks, voiceovers for digital content, and assistive technologies for individuals with visual impairments.

The other options focus on different functionalities that are not aligned with what Amazon Polly offers. For instance, creating visualizations for data analysis relates more to services like Amazon QuickSight, not a speech synthesis tool. Building chatbots with natural language processing pertains to services such as Amazon Lex, which specializes in understanding and generating human-like dialogues. Finally, managing APIs hosted by third-party providers would align with API management services like Amazon API Gateway, rather than Polly's text-to-speech capabilities.