> ## Documentation Index
> Fetch the complete documentation index at: https://docs-classic.cognigy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# NLU Connector Reference

You can select [NLU connectors](https://docs-classic.cognigy.com/ai/platform-features/nlu/external/nlu-connectors/overview) of your choice, Cognigy native connectors, third-party connectors, or create a custom connector.

> [card] [Cognigy NLU](https://docs-classic.cognigy.com/ai/platform-features/nlu/external/nlu-connector-reference/cognigy-nlu.md)
>
> The built-in NLU engine within Cognigy, providing automatic Intent and Slot recognition.

> [card] [Alexa](https://docs-classic.cognigy.com/ai/platform-features/nlu/external/nlu-connector-reference/alexa.md)
>
> Integration with Amazon Alexa NLU service for voice-based input and processing.

> [card] [Dialog Flow](https://docs-classic.cognigy.com/ai/platform-features/nlu/external/nlu-connector-reference/watson-assistant.md)
>
> Integration with Google Dialog Flow for advanced AI-driven conversations.

> [card] [Lex](https://docs-classic.cognigy.com/ai/platform-features/nlu/external/nlu-connector-reference/lex.md)
>
> Integration with Amazon Lex, used for building conversational interfaces.

> [card] [Luis](https://docs-classic.cognigy.com/ai/platform-features/nlu/external/nlu-connector-reference/luis.md)
>
> Integration with Microsoft LUIS for Intent recognition.

> [card] [Watson Assistant](https://docs-classic.cognigy.com/ai/platform-features/nlu/external/nlu-connector-reference/watson-assistant.md)
>
> Integration with IBM Watson Assistant for advanced AI-driven conversations.

> [card] [Code](https://docs-classic.cognigy.com/ai/platform-features/nlu/external/nlu-connector-reference/code.md)
>
> Allows custom integration with any third-party NLU provider.

> [card] [No NLU](https://docs-classic.cognigy.com/ai/platform-features/nlu/external/nlu-connector-reference/no-nlu.md)
>
> Option for users who don't require NLU processing.


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