Tracked or Non-Tracked Stock
Tracked stock is used when you want to track movement of item and non tracked stock is used when you want to add item to general stock.
Tracked Stock
In tracked stock you can track all the movements of item. In tracked stock you can perform move product operations. In tracked stock you can see all the information about item e.g its location, its container.
Non-Tracked Stock
In non-tracked stock you cannot track the movement of item. If non-tracked stock is selected, item will be added to general stock. You cannot perform move products operations. In non-tracked stock you cannot see its exact position.