Browser hijacking is the modification of a web browser’s settings. The term “hijacking” is used as the changes are performed without the user’s permission. A browser hijacker may replace the existing home page, error page, or search page with its own. These are generally used to force hits to a particular website, increasing its advertising revenue.
Some browser hijacking can be easily reversed, while other instances may be difficult to reverse. Various software packages exist to prevent such modification.
The homepages that are set by hijackers are often search pages, and many of these programs are spyware programs that track personal data.
Most installers will give users the opportunity to accept or decline an offer to install a hijacker; however, the request to decline the offer is often ignored or presented in a very confusing manner. This is done for the sole reason of tricking users into installing excessive bloatware and malware.