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Windows 11 key or Windows 11 Pro key is a unique 25-character code used to activate and verify the authenticity of your Windows operating system. Without a genuine Windows key, your system may run with limited features, constant reminders, or risk of being compromised. A valid Windows 11 product key ensures access to regular security updates, new features, and full personalization options. The Windows activation key links your device with Microsoft’s licensing system, confirming that your copy is original and not pirated. Always purchase keys from trusted sources to avoid fake or unauthorized licenses that may cause issues later.