A serial number is a unique and specific code that is used to identify a single unit. They have many practical uses, including deterring theft, preventing counterfeiting of products and helping to identify stolen or irregular goods.
Companies and even the government use serial numbers on all types of products, including electronics, automobiles and banknotes. These numbers help companies, government offices and private entities prevent issues such as theft and counterfeiting, keep track of items for inventory purposes, and help with quality control by identifying potential problems with a specific product. Oftentimes, companies use these serial numbers in case of a defect to determine exactly which and how many units were affected.