Spyware is a type of malware that is installed surreptitiously on personal computers to collect sensitive information about users, their computer or browsing habits without their informed consent. Spyware can be software tools and keyboard monitoring softwares that fulfill the purposes mentioned above. According to user's habit of understanding spyware, we classify Trojan which mainly steals user information as spyware as well.

 

Spyware is appearing commercialized and collectivized. It's designed soly for profit and has grouped into organizations. To maximize profit, any techniques can be utilized to produce software that serve economic purposes. They can be secretly downloaded as part of a free software, shared software, or UltraRscEditor, and be installed without user¡¯s authorization, resulting in spyware¡¯s wide distribution.