---
title: \(Legacy\) Virtual Agent NLU reference
description: Reference topics provide descriptions about the Virtual Agent Designer interface components and technical details to learn more about scripting methods, Natural Language Understanding system entities, and the Virtual Agent Interactions table.
locale: en-US
canonical_url: https://www.servicenow.com/docs/r/conversational-interfaces/va-parent-reference-nlu.html
release: brazil
topic_type: reference
last_updated: "2026-09-10"
reading_time_minutes: 1
breadcrumb: [\(Legacy\) Virtual Agent for NLU, Conversational Interfaces]
---

# \(Legacy\) Virtual Agent NLU reference

Reference topics provide descriptions about the Virtual Agent Designer interface components and technical details to learn more about scripting methods, Natural Language Understanding system entities, and the Virtual Agent Interactions table.

Starting with the Brazil release, Virtual Agent for NLU and Virtual Agent Lite are being prepared for future deprecation. It will be hidden and no longer activated on new instances but will continue to be supported. For details, see the [Deprecation Process \[KB0867184\]](https://support.servicenow.com/kb_view.do?sysparm_article=KB0867184) article in the Now Support Knowledge Base. For migration guidance, see [KB3159779: Virtual Agent NLU and Keyword Feature Deprecation Migration Guide](https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB3159779).

-   **[\(Legacy\) Virtual Agent Designer interface reference](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/brazil/markdown/conversational-interfaces/vad-reference-nlu.md)**  
The Virtual Agent Designer interface lets you create, modify, test, publish, and localize topics, topic blocks, and custom controls.
-   **[\(Legacy\) Virtual Agent NLU technical reference](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/brazil/markdown/conversational-interfaces/va-advanced-technical-reference-nlu.md)**  
Use these topics to learn more about scripting methods, NLU system entities, and the Virtual Agent Interactions table.