Your Mac's serial number is required for warranty service, among other benefits that Apple offers its customers. Therefore, while not commonly used, you may occasionally need to look it up. While you can always look on your Mac's chassis to find the printed label that contains the serial number, there are a number of additional ways do do this, some of which are more convenient than others.
Besides using the Mac's chassis, the easiest way to find your Mac's serial number is to use the About This Mac information panel that's in the Apple menu. … Read more