OEM – If your computer comes with pre-installed Windows 10, then an OEM license is embedded in the UEFI/BIOS firmware.You can transfer the Windows 10 Retail copy to another PC. Retail – This is a boxed copy, which can be obtained from a retail store or online from the Microsoft Store.
How do I know if I have an OEM or retail copy of Windows 10? There are typically 3 different types of Windows licenses: Retail, OEM and Volume Licensing.