The related operator searches for sites that are related to the submitted URL in terms of sites' contents. The MathWorld example below shows sites that are related to mathematics.
Example: related:mathworld.wolfram.com
Example: related:mathworld.wolfram.com
This operator follows the same rules as the link operator - an invalid URL will convert the related operator into a search term and this operator should not be combined with other operators or search terms.
Use this operator when you have exhausted your list of related search terms, or if you need a quick and broad scan of a site's related contents you are completely clueless about. Note that this operator may sometimes show unrelated sites.
You can use the info operator or click on the Similar link in the results list to perform the same search.
It might be interesting to note that Wikipedia will almost always be listed in the results when you use this operator.
