What do you mean by Cloaking?

Cloaking is a SEO (Search Engine Optimization) technique. Basically it's about presenting the crawler of search engines a different website than normal users. Clocking is showing the search engine one thing and your visitors another. This method is treated as spam and is not recommended to use.
 
Cloaking: in SEO if the webmaster tries to influence the search engine by making pages of targeted keywords invisible to draw good rankings for keywords. There is a difference in the content that is presented to users’ browsers and the search engines. Using the HTTP information and IP addresses, wrong webpages are sent. Massive penalties can be imposed by search engines that may include completely getting removed from the index when caught for 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.
 
A website that uses cloaking recognizes search engine spiders by their IP address. It returns web pages to search engine spiders that are different from the web pages that web surfers see. Usually, the cloaking software creates hundreds of web pages that are optimized for a special search term so that search engine spiders get the impression that the website contains a lot of relevant information about a special topic.
 
Also known as stealth, a technique used by some Web sites to deliver one page to a search engine for indexing while serving an entirely different page to everyone else. There are opposing views as to whether or not cloaking is ethical. Opponents see it as a bait-and-switch, where a Web server is scripted to look out for search engines that are spidering in order to create an index of search results. The search engine thinks it is selecting a prime match to its request based on the meta tags that the site administrator has input. However, the search result is misleading because the meta tags do not correspond to what actually exists on the page. Some search engines, such as Lycos, Hotbot and Excite, even ban cloaked Web sites. Proponents of cloaking assert that cloaking is necessary in order to protect the meta data, as only the spider is supplied with the meta tags.
 
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. When a user is identified as a search engine spider, a server-side script delivers a different version of the web page, one that contains content not present on the visible page, or that is present but not searchable. The purpose of cloaking is sometimes to deceive search engines so they display the page when it would not otherwise be displayed (black hat SEO). However, it can also be a functional (though antiquated) technique for informing search engines of content they would not otherwise be able to locate because it is embedded in non-textual containers such as video or certain Adobe Flash components. As of 2006, better methods of accessibility, including progressive enhancement, are available, so cloaking is no longer considered necessary by its proponents.

This from Wikipedia. Hope this help.
 
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.In cloaking, the search engine and the user are literally not on the same page. Therefore, both the user and the search engine are being deceived.
 
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