Antivirus software protects your computer by scanning every file you download for viruses and other malware. Most of the time, you’ll want to leave your antivirus program running as-is. If it’s ...

Microsoft Defender isn't bad, but it's not enough to fully protect your PC. You don't have to pay extra, though—just use one of the top free antivirus apps we've tested.

What Is a Computer Virus? A computer virus is a program. Like other programs, it’s defined by what it does, and the big thing a virus does is replicate itself. The virus exists as a collection of ...

ZDNET tested the best antivirus software on the market, with support for multiple operating systems, VPNs, and robust protection.