Browser hijacking is a type of cyberattack where malicious software or scripts alter a user's web browser settings without permission. Common changes include modifying the default homepage, search engine, or new tab page, and installing unwanted toolbars or extensions. The goal is often to redirect traffic to specific websites, generate advertising revenue, or collect personal data. Victims may notice unfamiliar pages loading, increased pop-up ads, or slower browser performance. Browser hijackers can be installed through malicious downloads, deceptive ads, or bundled software. Removing a browser hijacker typically requires resetting browser settings, uninstalling suspicious extensions, and running reputable anti-malware tools.