Foistware - A definition

Foistware is software which is installed with completely unrelated programs. That means that there is no particular property in the software that makes it Foistware, but rather the context in which it was installed.

Example of foistware:
An Internet Explorer search toolbar bundled with a MP3 player.
An anti-virus program bundled with a word processor.

Developers of free sofware with large distribution sometimes get paid to bundle unrelated software with their software. The Foistware in most cases mentioned in the End User License Agreement. Example of software that include unrelated software is Kazaa, iMesh, BikiniDesk, etc.