Sometimes abbreviated as Serial No., SN, S/N, or SNID, a serial number is a unique number used for identification and inventory purposes. A serial number allows a company to identify a product and get additional information about it for replacement or to find compatible parts. Pictured is an example of what a serial number may look like on the back or side of a computer.
Serial No. 4CE0460D0G
Model No. p6774y
Despite the name, a serial number often contains letters and numbers. How many characters make up a serial number differs greatly, depending on the manufacturer, product, and model. Most serial numbers have at least six or seven characters, and some serial numbers have twenty or more.
Locating serial numbers
Hardware - A serial number for a hardware device is often on the bottom or back of the device.
Software - Software serial numbers, also known as product identification numbers and CD keys, may be accessible by logging into the software website with a verified user account. They may also be listed on the software's physical packaging or a CD/DVD jewel box.