# OPC UA

OPC UA (**O**pen **P**latform **C**ommunications **- U**nified **A**rchitecture) is a machine-to-machine (M2M) communication protocol developed by the [OPC Foundation](https://opcfoundation.org/). It is widely used for communication with industrial equipment and systems for data collection and control.

* [OPC UA Client](https://docs.cybus.io/2-0-0/documentation/industry-protocol-details/opc-ua/opc-ua-client)
* [OPC UA Server](https://docs.cybus.io/2-0-0/documentation/industry-protocol-details/opc-ua/opc-ua-server)
* [OPC UA Object Types](https://docs.cybus.io/2-0-0/documentation/industry-protocol-details/opc-ua/opc-ua-object-types)
* [OPC UA Server References](https://docs.cybus.io/2-0-0/documentation/industry-protocol-details/opc-ua/opc-ua-server-references)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.cybus.io/2-0-0/documentation/industry-protocol-details/opc-ua.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.