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description: The Language Understanding (LUIS) service allows your application to understand what a person wants in their own words. LUIS uses machine learning to allow developers to build applications that can receive user input in natural language and extract meaning from it.
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# Language Understanding (LUIS) documentation

Learn how Language Understanding enables your applications to understand what a person wants in their own words.

## About Language Understanding (LUIS)

### Overview

- [What is language understanding?](what-is-luis)
- [LUIS portal](https://www.luis.ai)

### Concept

- [Plan your app](concepts/application-design)
- [Iterative app design](concepts/application-design)
- [DevOps practices](luis-concept-devops-sourcecontrol)

### What's new

- [What's new?](whats-new)

### video

- [Ignite 2019: Advanced Natural Language Understanding (NLU) models using LUIS](https://www.youtube.com/watch?v=JdJEV2jV0_Y)

## Create intents, entities, and features

### Concept

- [Intents](concepts/intents)
- [Entities](concepts/entities)
- [Utterances](concepts/utterances)
- [Phrase list features](concepts/patterns-features)

### Quickstart

- [Portal: Create a new LUIS app](luis-get-started-create-app)
- [Using C# SDK](client-libraries-rest-api?pivots=rest-api)
- [Using Python SDK](client-libraries-rest-api?pivots=rest-api)

### How-To Guide

- [Create a new LUIS app](how-to/sign-in)
- [Add intent with example utterances](how-to/intents)
- [Add entities](how-to/entities)
- [Add phrase list feature](concepts/patterns-features)

## Version, train, test, and publish

### Concept

- [Versioning](concepts/application-design)
- [Interactive testing](how-to/train-test)
- [Batch testing](luis-how-to-batch-test)

### Quickstart

- [Using SDK](client-libraries-rest-api?pivots=rest-api)

### How-To Guide

- [Version your app](luis-how-to-manage-versions)
- [Perform interactive testing](how-to/train-test)
- [Perform batch testing](luis-how-to-batch-test)
- [Train your app](how-to/train-test)
- [Publish prediction endpoint](how-to/publish)

## Get prediction from endpoint

### Quickstart

- [Using SDK](client-libraries-rest-api?pivots=rest-api)

### Quickstart

- [With C# using REST](how-to/intents)
- [With Go using REST](how-to/intents)
- [With Java using REST](how-to/intents)
- [With Node.js using REST](how-to/intents)
- [With Python using REST](how-to/intents)

## Reference

### Reference

- [Developer resources](developer-reference-resource)
- [App limitations](luis-limits)
- [Prebuilt entities](luis-reference-prebuilt-entities)
- [Custom Entities](reference-entity-machine-learned-entity)
- [Prebuilt domains](luis-reference-prebuilt-domains)

## Help and feedback

### Reference

- [Support and help options](../cognitive-services-support-options?context=/azure/ai-services/luis/context/context)
- [Troubleshooting](faq)