Pornware is the term used for programs that display pornographic material to the user.
Programs in the Pornware class may be deliberately installed by the user in order to search for and obtain pornographic material. In such cases, the programs are not unwanted.
On the other hand, the very same programs can be installed on a user’s computer by malicious users by exploiting operating system or browser vulnerabilities, or by using Trojans such as Trojan-Downloader and Trojan-Dropper. This is usually done to push advertisements for fee-based pornographic websites and services that a typical user might otherwise not be aware of.