Adware software can display and/or download advertisements and may be considered privacy-invasive. Adware applications are however not harmful and their detection is disabled by default in AVG. Adware tracks your computer's web usage to feed you undesired ad pop ups or redirect you to unwanted pages.
Adware can hijack your home page and take you to sites you aren’t interested in, allow pop up ads that are disruptive to your system. Since they run every time you turn on your computer, they can cause slowdowns and software conflicts that can make your computer unstable.