"Hey, the touchpad in the laptop I bought from you isn't working as it should. Can you please replace it?"

 

Not exactly the best way to start your day, but more often than not, you'll be facing situations like this in your business - especially in the electronics, automobile or any industry where replacements, warranties etc., are quite common. In most of these cases, you need to track which piece that was sold to the customer turned out to be defective. If you have this information, you can get it from your customer, and contact your vendor for a replacement or do the replacement yourself if possible. This is why you need serial number tracking.