# 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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# 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.blynk.io/en/blynk.console/templates/datastreams.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.