• This question belongs to the Information Technology (IT) or Computer Awareness subject, specifically under the Computer Security or Utility Software section.
What is Windows Defender?
Windows Defender (now called Microsoft Defender Antivirus) is a security program built into the Windows operating system. It acts as the first line of defense for your computer.
Malware Protection: It scans for and removes "Malicious Software" (malware), which includes viruses, spyware, and ransomware.
Real-time Protection: It runs in the background, checking every file you open or download to ensure it isn't dangerous before it can run.
Threat Neutralization: If it finds a threat, it "quarantines" it (locks it away) so it cannot infect your other files.