Cloaking is a black hat seo technique; essentially it uses various techniques to deliver different content to a human user than the search engine crawlers would get when crawling the website, by detecting that the crawler is present and routing it to content optimized for the search engine. This is done through IP recognition. It's a lame technique that hasn't worked well since the early days of the web; nevertheless, people still try it. Avoid Cloaking.
