Windows Defender is built into the latest version of Windows, which can help you protect your computer from viruses and other malicious software.
If your computer is running an old version of Windows 7, you can download Microsoft security software for free.
Windows Defender, formerly known as Microsoft Anti Spyware, can run on Windows XP and Windows Server 2003 operating systems and is built into Windows Vista, Windows 7, Windows8 and Windows 10.
The main functions are:
1, real-time defense against spyware, viruses, Rootkit and other malicious software.
2. On-line system scanning and cleaning /3. Dynamic signature service.
3. Offline system scanning and cleaning.
4. Enhance the protection of Rootkit and Bootkit.
References:
Baidu encyclopedia -Windows Defender
References:
Microsoft official website -Windows Defender