Webmaster's tip for search engine optimization

I have noticed recently that many websites which rank highly in search engine rankings have a <link rel="archive" href="archive pages"> in there head. Anything in the link is not displayed by the browser but is seen by the search bots.
In a way these links are helpful in allowing search bots index the pages in the links although the links are not displayed to the user. You can use this feature to make search bots index the pages which are not linked through your main page. This makes your website more cohesive and easily searchable by the search bots.