Browser hijacking is when your Internet browser (eg. Chrome, FireFox, Internet Explorer) settings are modified. Your default home or search page might get changed or you might get a lot of advertisements popping up on your computer. This is done through malicious software (malware) called hijackware. A browser hijacker is usually installed as a part of freeware, but it can also be installed on your computer if you click on an attachment in an email, visit an infected site (also known as a drive-by download) or download something from a file-sharing site.
Once your browser has been hijacked, the cybercriminal can do a lot of damage. The program can change your home page to a malicious website, crash your browser or install spyware. Browser hijackers impede your ability to surf the web as you please.