IBM Watson Text to Speech is a cloud-based service that converts written text into natural-sounding speech. It uses advanced artificial intelligence to generate audio in various languages and voices, making it useful for applications like virtual assistants, accessibility tools, and customer service. The service allows developers to customize the voice output by adjusting parameters such as pitch, speed, and tone. This flexibility enables businesses to create a more engaging user experience, whether for mobile apps, websites, or interactive voice response systems.