Adware displays advertising content, often in a manner or context that may be unexpected and unwanted by users. Adware programs often create unwanted effects on a system like displaying pop-up advertisements and, in some instances, the lowering of either network connection or system performance. Some adware can also collect the system's browsing information (e.g. sites visited) and send the information to a remote server on the Internet. The gathered information is used by a remote Web site or user for marketing purposes.
Browser Hijackers (BHJK) change the settings of the user's Web browser, including changing the default home page.