Short answer
A tracking number is a unique code a carrier assigns to a single package so that it can be followed through each scan from pickup to delivery. Each package gets its own number, so an order shipped in two boxes has two.The format tells you the carrier. UPS numbers commonly start with "1Z". FedEx and USPS use long numeric codes of different lengths. When a Shopify store marks an order as fulfilled, it adds the tracking number and carrier, and Shopify sends the customer a shipping email with a link to follow it.
Customers lean on that link heavily, and it lets them down in predictable ways. The number exists before the carrier has the package, so the first status is often "label created" for a day or two. Scans are not continuous, so a parcel can look frozen while it moves across the country. Numbers get handed from one carrier to another for the last mile. And a tracking link for order #1093 only covers one package if the order was split.
The common mistake is treating the tracking number as a complete answer. Sending it again to a customer who says it is not updating answers nothing. What helps is reading the scans and saying what they mean in plain words.
Tracking statuses and what they usually mean
| Status | What is usually happening |
|---|---|
| Label created | the store printed a label, the carrier has not scanned it yet |
| In transit | moving between carrier facilities, scans can be days apart |
| Out for delivery | on the vehicle for delivery today |
| Exception | a delay, failed attempt or address problem |
| Delivered | scanned as delivered at the address or a pickup point |
Asked where an order is, Aide finds it, pulls the newest scan and explains it in plain words with the expected delivery and a tracking card in chat. UPS and FedEx are read at the source; USPS parcels show what Shopify reports. Split orders get every package, not only the first. See how order tracking questions get answered from live data.