# Model
## Overview
A Model is an object that groups multiple objects together so they can be **affected by physics collectively** and controlled as a single unit. This allows individual objects to be treated as one entity or for specific actions to be applied simultaneously.
## Properties
### Primary Part
This property sets the Part that will act as the center of the Model. For Character Models, the PrimaryPart is the HumanoidRootPart.
### Transform
* Origin
* Position: Defines the world coordinates of the Model.
* Orientation: Sets the rotation direction of the Model.
When the PrimaryPart is not set, the Origin is arbitrary. When the PrimaryPart is set, the Origin is based on the PrimaryPart.
## Grouping Objects into a Model
To group objects, select the objects you want to group, right-click, and click **Group As a Model** (or press Ctrl + G).
When objects are grouped into a Model, clicking on a **Part within the Model** in the Viewport will select the entire Model instead of the individual Part. To select only the Part, **hold the Alt key** while clicking. To select multiple Parts within the Model, hold **Alt + Ctrl** while clicking.
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