# Saving

{% hint style="warning" %}
This only edits the save data in memory. See [Writing Changes](/esave/scripting/saving-and-loading/data-management/writing-changes.md).
{% endhint %}

Each piece of data in a save file has an ID (string). This makes it possible to retrieve specific data by ID.

Saving data can be done with a single line with `SaveFile.AddOrUpdateData`. 

```csharp
saveFile.AddOrUpdateData("DataID", data);
```

The first parameter is the ID of the data, and the second parameter is the data itself. Any serializable data type can be saved. However,  most Unity types are not savable. ESave can save common Unity data types, including (but not limited to) `Vector2`, `Vector3`, `Quaternion`, `Color`, and `Transform`.

## Mutli-Add

Adding multiple data entries in a single call is only possible in the [Pro version](https://u3d.as/3vCT).


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