Cloaking is a technique used to deliver the content on a webpage to a search engine in a way that is different to what the user was looking for.
Do you mean cloaking? As in when you show one thing to your end users but something else to search bots?
Cloaking is a search engine optimization (SEO) technique in which the content presented to the search engine spider is different from that presented to the user's browser. This is done by delivering content based on the IP addresses or the User-Agent HTTP header of the user requesting the page.