Website cloaking is a technique some website owners use to improve their search engine rankings. When a website is cloaked, it serves different content to search engine crawlers than to human visitors. This can be done by delivering different HTML codes or using JavaScript to show different content depending on the user-agent. Cloaking can be used to improve search engine rankings by showing the crawlers content that is optimized for target keywords. However, it can also be used to deceive search engines, resulting in penalties. If you suspect a website is cloaking, you can check the source code or use a tool like Webmaster Tools to see if the site serves different content to Googlebot.