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Microsoft Defender Antivirus (formerly Windows Defender) is an antivirus software component of Microsoft Windows. It was first released as a downloadable free anti-spyware program for Windows XP and was shipped with Windows Vista and Windows 7 .
Many antivirus products use "third-party antivirus engine". This means that the antivirus engine is made by another producer; however, the malware signature and/or other parts of the product may (or may not) be done from the owner of the product itself.
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Since its January 13, 2005, [2] Microsoft releases the updated tool every second Tuesday of every month (commonly called "Patch Tuesday") through Windows Update, at which point it runs once automatically in the background and reports if malicious software is found. The tool is also available as a standalone download.
The service delivers software updates for Windows, as well as the various Microsoft antivirus products, including Windows Defender and Microsoft Security Essentials. Since its inception, Microsoft has introduced two extensions of the service: Microsoft Update and Windows Update for Business.
Renamed Windows Defender to Microsoft Defender Antivirus; 10.0.18950 [30] Fast ring: July 31, 2019 Improvements to Japanese IME and Snip & Sketch; 10.0.18956 [31] Fast ring: August 7, 2019 Redesigned Network Status page in Settings app; Improvements to Traditional Chinese IME; Updated Calculator app; 10.0.18963 [32] Fast ring: August 16, 2019
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