> For the complete documentation index, see [llms.txt](https://docs.cybus.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cybus.io/2-0-3/documentation/industry-protocol-details/opc-ua.md).

# 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](/2-0-3/documentation/industry-protocol-details/opc-ua/opc-ua-client.md)
* [OPC UA Server](/2-0-3/documentation/industry-protocol-details/opc-ua/opc-ua-server.md)
* [OPC UA Object Types](/2-0-3/documentation/industry-protocol-details/opc-ua/opc-ua-object-types.md)
* [OPC UA Server References](/2-0-3/documentation/industry-protocol-details/opc-ua/opc-ua-server-references.md)


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