Or they might claim to offer free downloads, software updates, or plug-ins to try to trick you into installing unwanted software. Some pop-ups are third-party ads that use phishing tactics such as warnings or prizes to trick you into believing they’re from Apple or another trusted company, so that you’ll share personal or financial information. Pop-ups can be ads, notices, offers, or alerts that open in your current browser window, in a new window, or in another tab. Learn how to block pop-up windows and handle persistent ads on your iPhone, iPad, or Mac.