# Store Variable ?

Store variables can be used across various streams. The big difference compared to temporary and helmut variables are that those can be created, modified and deleted within a stream.

For further informations have a look here: [Stream Variable Store](https://docs.helmut.de/helmut4-releases/helmut4-components/streamdesigner/stream-variable-store)

### Use of the wildcard

The wildcard is used in the following ways:

* Variable key: test1
* Variable value: hello<br>
* {store.variable.?}
* For the following input (?) --> test1
  * {store.variable.test1}
* The output is going to be --> hello

<figure><img src="https://content.gitbook.com/content/cJYkTyk9qgh7aCR6dHIm/blobs/KamoV1YvXUOCsFz147el/image.png" alt="" width="351"><figcaption><p>Usage of a store variable</p></figcaption></figure>