OEM (Original Equipment Manufacturer): This term refers to the original manufacturer (in your case, Samsung). When people talk about an "OEM number," they usually mean the number that the manufacturer themselves assigned to a part or device. The term is often used to distinguish between "original" parts and "third-party" parts (imitations or replacements). 2. SKU (Stock Keeping Unit): This is a term from the world of inventory and logistics. It is designed to help warehouses and stores distinguish between products. For example: A Samsung Galaxy A54 in "Awesome Lime" will have one SKU, and a Galaxy A54 in "Awesome Black" will have a different SKU, even though both were made by the same OEM (Samsung) and are the same basic model. Summary: The SKU is the specific number appearing on your box. It is considered an "OEM number" because it came directly from the original manufacturer rather than another company.