A pop-up blocker is a software tool designed to prevent unwanted pop-up windows from appearing on your screen while browsing the internet. These pop-ups often contain advertisements, promotions, or other content that can be distracting or annoying. By blocking these windows, pop-up blockers help create a smoother and more enjoyable online experience. Most modern web browsers, such as Google Chrome and Mozilla Firefox, come with built-in pop-up blockers. Users can also install additional pop-up blocking extensions for enhanced control. While pop-up blockers are effective, some legitimate websites may use pop-ups for important notifications, so users can adjust settings to allow certain pop-ups if needed.