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

# NLU Connector Reference

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

<CardGroup cols={2}>
  <Card title="Cognigy NLU" href="/ai/platform-features/nlu/external/nlu-connector-reference/cognigy-nlu">
    The built-in NLU engine within Cognigy.AI, providing automatic Intent and Slot recognition.
  </Card>

  <Card title="Alexa" href="/ai/platform-features/nlu/external/nlu-connector-reference/alexa">
    Integration with Amazon Alexa NLU service for voice-based input and processing.
  </Card>

  <Card title="Dialog Flow" href="/ai/platform-features/nlu/external/nlu-connector-reference/watson-assistant">
    Integration with Google Dialog Flow for advanced AI-driven conversations.
  </Card>

  <Card title="Lex" href="/ai/platform-features/nlu/external/nlu-connector-reference/lex">
    Integration with Amazon Lex, used for building conversational interfaces.
  </Card>

  <Card title="Luis" href="/ai/platform-features/nlu/external/nlu-connector-reference/luis">
    Integration with Microsoft LUIS for Intent recognition.
  </Card>

  <Card title="Watson Assistant" href="/ai/platform-features/nlu/external/nlu-connector-reference/watson-assistant">
    Integration with IBM Watson Assistant for advanced AI-driven conversations.
  </Card>

  <Card title="Code" href="/ai/platform-features/nlu/external/nlu-connector-reference/code">
    Allows custom integration with any third-party NLU provider.
  </Card>

  <Card title="No NLU" href="/ai/platform-features/nlu/external/nlu-connector-reference/no-nlu">
    Option for users who don't require NLU processing.
  </Card>
</CardGroup>