What does cloaking checker tool do in seo?
 

Cloaking involves showing one version of a Web page to users and a different version, usually stuffed with other keywords, to the search engine spiders. The SEO Cloaking Checker detects whether a Web site uses "cloaking," a server technique that some sites utilize to try to fool the search engines into awarding rankings the Web pages do not deserve. This is a stealth method that Google and the other search engines consider deceptive, since it attempts to bias the spiders into ranking the Web page undeservedly higher or for a different keyword term.

This tools tries to check whether your website is 'cloaking' it's contents for various search engines i.e it detect whether a varied version of text is displayed when a search engine bot views the website just compared it with a normal visitor viewing the website.

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A website that different contents to search engine crawling the sites is known as cloaking. Cloaking a website is done by delivering content based on the User-Agent HTTP or IP addresses.