After placing an order in an online store or on a trading platform such as Amazon, Aliexpress, Ebay, your order receives a personal number. This code, given by the store, is needed to distinguish your order between orders of other users.
The track number of the parcel is given by the transport or postal company and is needed so that the mail can distinguish the parcel from others that it also sends to recipients. Remember: it is only possible to find out the location of the parcel to which the order was sent from the online store by using the parcel code. But it is possible to find it by order code only in exceptional cases, for example, stores like ASOS or sent via eShopWorld.