Malvertising, short for malicious advertising, is a cyber threat where harmful code is hidden within online ads. These ads can appear on legitimate websites and, when clicked, may install malware or redirect users to dangerous sites. You don’t even have to click sometimes—just visiting a page with infected ads can be risky. To prevent malvertising, use a reliable ad blocker, keep your browser and antivirus software updated, and avoid clicking on suspicious or unfamiliar ads. Stay alert and protect your device from hidden threats.