A Windows 10 Home Retail Key is a 25-character activation code used to authenticate and validate the retail version of the Windows 10 Home operating system. Unlike OEM keys, which are tied to a specific device, a retail key can be transferred to a different computer if needed, as long as it's uninstalled from the original device. This key grants access to all the features of Windows 10 Home, such as the Start Menu, Cortana, Microsoft Store, and enhanced security options.

The product key follows the format: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX.

This key is typically provided with physical copies of Windows 10 or via digital purchases. It is required during installation or when reactivating Windows after hardware changes.