Adware is a category of software applications that displays advertisements on computers or changes search results in browsers to earn money for their creators from user clicks. Some adware programs are purely malicious and don’t ask for user consent at all. Others fall in a grey zone where users are notified about their installation through confusing user agreements or through enabled-by-default installation options. Adware programs can change the browser’s home page and the default search engine, can inject rogue results into search pages and can also inject rogue advertisements into legitimate websites.”]