A Windows 11 Pro Retail Product Key is a 25-character activation code used to authenticate and activate the retail version of Windows 11 Pro. This edition is designed for professionals, businesses, and advanced users, offering features such as advanced security tools (e.g., BitLocker), remote desktop, Hyper-V for virtualization, and the ability to join a domain or Azure Active Directory.

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

A retail key allows flexibility in transferring the license to another device, unlike OEM keys, which are tied to the original hardware. It is required during installation or after significant hardware changes to ensure the system is activated and running a genuine copy of Windows 11 Pro.