# Variables

### Description

Variables are, by definition, data structures holding a specific value that can be edited during runtime.

Each variable is defined by its name, type, and scope inside [OverScriptManager](/over-sdk-manual/over-visual-scripting-legacy/visual-scripting-essentials/overscriptmanager.md) and [OverScript](/over-sdk-manual/over-visual-scripting-legacy/visual-scripting-essentials/overscript.md).

In general, variables can be distinguished into two main categories:

* **GLOBAL**: Variables having the widest scope possible, that can be accessed by every script in a Scene. [OverScriptManager](/over-sdk-manual/over-visual-scripting-legacy/visual-scripting-essentials/overscriptmanager.md) is responsible for handling global variables and it is the only place in which they can be defined
* **LOCAL**: Variables that have their scope limited only to a specific [OverScript](/over-sdk-manual/over-visual-scripting-legacy/visual-scripting-essentials/overscript.md), in which they are defined and reside. Local variables cannot be referenced by a different script.

<figure><img src="/files/TDuWiOn7djHNyhrB5BfN" alt=""><figcaption></figcaption></figure>

#### Handling variables

Once a variable is correctly defined, a variable is listed in the Graph. A variable can be presented in two kinds of nodes, depending on its usage:

* **GET Node**: a Plain Node whose purpose is to deliver the current value of the variable.
* **SET Node**: a Flow Node whose purpose is to edit the value of the variable.

<figure><img src="/files/DXOfVDjxcTHQtUIOX70p" alt=""><figcaption></figcaption></figure>

A variable may be defined for any type of object. It is therefore possible, thanks to variables, to interact with any component associated with objects in the scene.


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