An integrated threat protection solution designed to detect, investigate, and respond to cyber threats across Microsoft 365 services.
Microsoft Defender is the Microsoft's built-in security solution. On Windows 10 and Windows 11, Microsoft Defender Antivirus is included at no additional cost and provides real-time protection against viruses, malware, ransomware, phishing, and other threats.
For mobile devices, Microsoft Defender is available as part of Microsoft 365 Personal or Family subscriptions and supports Android and iOS. It focuses on phishing protection, malicious website detection, privacy monitoring, and device security rather than traditional antivirus scanning, due to mobile operating system restrictions.
If your desktop and laptop run Windows 10 or 11, Microsoft Defender is a common choice. If you also want protection across Windows, Android, iPhone, and macOS devices with centralized management, a Microsoft 365 subscription that includes Microsoft Defender provides a unified security experience.
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hth
Marcin