What is metadata in Control rig ?

hey giuys please help me i am stuck for 8 hours for this ■■■■ , i am using Control Rig Samples Pack in Epic Content - UE Marketplace this Example of Control Rig from Epics and don’t get wth is this metadata and how it is used and why ? no definintion of the functions

This tutorial explained it pretty darn well:

Here’s my attempt:
When creating a rig using the Construction Event, you can Store all the procedurally-generated Controls directly into the Bone it was referenced to using Metadata.
So, if the Hand Bone was used to spawn the Hand_ctrl, you can use a Set Metadata Node to create a new Label on the Hand Bone called Control, and store the Hand_ctrl directly into this on-bone variable.

Later, during the Forward or Backward solves, you can then use a Get Item Metadata node to call its Control variable, and plug it where you may need it.

This becomes REALLY useful when you have many Skeletons of the same naming convention (Mixamo, for instance), but with different proportions.
A single Control Rig could work on ALL the Skeletons with zero modification.

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