Windows Defender is a built-in antivirus and malware protection tool in Windows 10 that helps keep your computer safe from viruses and other malware. Here’s how to use Windows Defender for virus and malware protection:

1. Open the Windows Security app: Click on the Start menu and select “Windows Security” or search for “Windows Security” in the search bar and click on the app.
2. Check for updates: Before running a scan, make sure Windows Defender is up to date by clicking on “Virus & threat protection” and then clicking “Check for updates”.
3. Run a scan: In the Windows Security app, click on “Virus & threat protection” and then click on “Scan options”. Select the type of scan you want to run, such as a quick scan or a full scan, and then click “Scan now”. Windows Defender will scan your computer for viruses and malware.
4. Quarantine or remove threats: If Windows Defender detects any threats during the scan, it will display them in the “Threat history” section. You can choose to quarantine or remove the threats.
5. Customize settings: You can customize Windows Defender settings to fit your preferences. In the Windows Security app, click on “Virus & threat protection” and then click on “Manage settings”. From there, you can adjust settings such as real-time protection, cloud-delivered protection, and automatic sample submission.

By following these steps, you can use Windows Defender to help keep your computer safe from viruses and malware.