What is Cloaking?
The Cloaking, also known as stealth, is a method used to raise a website's search engine rank. It is based on providing the feeling to search engine that a website carries the content. By cloaking users get to other websites than they expect. They see just a sympathetic and good looking website, but the content they search for is different.
It is questionable if the cloaking is ethical. It often depresses users and it is considered to be a black hat technique.