An Inventory stores an indefinite amount of Items.
An Item is a Resource which could be a health potion, a weapon, a charm or whatever your game needs.
You can put constraints about adding, removing or using items using the Item tag system combined with the Inventory's one.
An Inventory can also instantiate an Item scene, so it can help you to render it in your 2D or 3D world.
With an Inventory you can activate, add, remove or search for one or more items.