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.

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

Cyber security is about protecting our digital world from bad actors. Threats come in many forms, from sneaky malware to outright attacks. People try to steal or damage things online for money, ...