What is a "serialized actor"

Development Programming & Scripting C++
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1

In the beginning of actor.h, there is a sentence in the comment:

PostLoad/PostActorCreated - Do any setup of the actor required for construction. PostLoad for serialized actors, PostActorCreated for spawned.

I wonder what “serialized actor” means here. Is there a process in the game called serialization?

Thanks,

wcl1993

2

Serialization is reading/writing files to I/O. Typically there is an interface to