> 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/ai/conversational-ai/helpful-terminology-for-conversational-ai/experts/list-of-experts-developed-so-far/catch-all-expert-deployed.md).

# Catch All Expert - Deployed

As the name suggests, the CatchAllExpert is used to respond to all user utterances. The response generated by this expert is used only when none of the other experts respond. Usually this will respond with a phrase similar to “I didn’t catch that” or “I couldn’t understand that”. This expert is necessary in all applications, however its behavior can be customized as appropriate for the application.

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