"Individual SN" means each serial number corresponds to a single license. For example, if you order 5 licenses, you'll get 5 separate serial numbers. This setup is useful for group purchases.
In contrast, "Unified SN" has one serial number linked to multiple licenses. If you order 5 licenses, you'll receive just 1 serial number, valid for installing on 5 computers. This streamlines license management, suitable for company teams.