> For the complete documentation index, see [llms.txt](https://docs.blynk.io/en/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.blynk.io/en/blynk.console/templates/datastreams.md).

# Datastreams

A datastream is a way to structure data that flows between your device and the Blynk platform. Think of it as a container for a specific value — like sensor readings, telemetry, or actuator states.

Each device manages its own value for every datastream.

Values can be:

* Updated by the device and shown in widgets.
* Updated by certain widgets, which then send the new value back to the device.

This enables seamless two-way communication between your device and the Blynk interface.

![](/files/-MSgvPjCydBBmWW9vQtk)


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