# Set Variable (/docs/workflows/reference/category/data/setVariable)

> For the complete documentation index, see [llms.txt](https://docs.tandemcx.ai/llms.txt). Any page on this site can be fetched as Markdown by appending `.md` to its URL.

Create and save variables for this conversation.

Use Set Variable to store and transform data during a flow run. Variables are scoped to the current conversation and can be referenced by any downstream node with the `$(name)` syntax. Beyond simple assignment, this node can derive a value from arithmetic and string operations, so you can compute a value once and reuse it later instead of recomputing it in multiple places.

**Category:** Data  
**Provider:** Core  
**Latest version:** 1.0.0

## Fields

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| Variables (`variables`) | setMultiVariables | Yes | Set variables with simple values or expressions. |

## Exits

- `default` (required)
- `invalidInput` (system)
- `fallback` (system)

System exits (auto-injected, hidden when unwired): `invalidInput`, `fallback`.