What do you mean by Cloaking?

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.

Cloaking is a technique used to deliver the content on a Web page to a search engine in such a way that different content than what is delivered to a regular human user appears on the search engine. The goal of cloaking is to boost a website's search engine rank on certain keywords.