# Overview

Sometimes you want to synchronize entities that are connected to other entities. These relationships can be references between entities, but they can also involve direct parent-child relationship between game objects, or more nuanced use cases.

Here's a guide for what technique to use, depending on the situation:

* If you have an entity that needs to keep a nullable reference to another entity, use a normal [Entity reference](/0.5.2/connected-entities/entity-references.md). This includes any existing MonoBehaviour that has GameObject or Transform fields that you want to synchronize over the network.
* If the entities are placed in a hierarchy, use the techniques for [parent-child relationships](/0.5.2/connected-entities/parent-child.md).


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