toc

{:navgroup: .navgroup}
{:topicgroup: .topicgroup}

{: .toc subcollection="natural-language-understanding" audience="service" href="/docs/services/natural-language-understanding/getting-started.html"}
Natural Language Understanding

    {: .navgroup id="learn"}
    getting-started.md
    index.md
    [Demo](https://natural-language-understanding-demo.ng.bluemix.net/)
    additional-resources.md
    {: .navgroup-end}

    {: .navgroup id="howto"}
    customizing.md
    overriding-language-detection.md
    migrating.md
    {: .navgroup-end}

    {: .navgroup id="reference"}
    [API reference](https://www.ibm.com/watson/developercloud/natural-language-understanding/api/v1/)
    categories.md
    detectable-languages.md
    entity-types.md
    language-support.md
    relations.md

    {: .topicgroup}
    Watson SDKs
        [Android SDK](https://github.com/watson-developer-cloud/android-sdk)
        [Java SDK](https://github.com/watson-developer-cloud/java-sdk)
        [Node.js SDK](https://github.com/watson-developer-cloud/node-sdk)
        [PHP SDK](https://github.com/ThomasIBM/php-sdk)
        [Python SDK](https://github.com/watson-developer-cloud/python-sdk)
        [.NET SDK](https://github.com/watson-developer-cloud/dotnet-standard-sdk)
        [Swift SDK](https://github.com/watson-developer-cloud/ios-sdk)
        [Unity SDK](https://github.com/watson-developer-cloud/unity-sdk)

    [Watson GitHub repos](https://github.com/watson-developer-cloud/)
    {: .navgroup-end}

    {: .navgroup id="help"}
    release-notes.md

    {: .topicgroup}
    Developer community
        [StackOverflow](https://stackoverflow.com/questions/tagged/watson-nlu)
        [developerWorks Answers](https://developer.ibm.com/answers/topics/natural-language-understanding/)
        [WDC Slack channel](http://wdc-slack-inviter.mybluemix.net/)
    {: .navgroup-end}