> For the complete documentation index, see [llms.txt](https://docs.siminsights.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.siminsights.com/hyperskill/authoring-a-simulation/simulation-settings/experience-settings/conversational-ai.md).

# Conversational AI

NLU Engine:  The engine used for the Conversational AI system. Recommended to try the different options out to see what fits best for the simulation.

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TTS Engine: The engine used for the text-to-speech system.

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Virtual Person Language: The primary language for the text-to-speech output. For example, if the output response is expected to be Spanish, select the Spanish option to get a better pronunciation.