It defines what and how the data be recorded. You can preview this data in the inspector. You also can create your item parameter using our template.
Note that no any Unity Game Object Reference will be supported.
You should not directly access Item Parameter as this component is used to handle the saving and loading actions. The data types in the Item Parameter are generic, and they will be overridden frequently. You should use the Item Component to access the data safely.
Refer to Item Component.