About Spiders and External Links
Spiders representing the Internet's search engines regularly crawl the World Wide Web to look for websites and other content to add to the search engines' databases. They follow the hyperlinks that connect websites on the Internet.
When analyzing your Website's external links to websites, search engines will attempt to determine the relative importance of the originating Websites. This means that if an originating Website offers similar or related content to the one it is pointing to, the link will receive a higher rating than if the content was entirely unrelated. As well, an originating Website may be ranked based on the links that are pointing to it, and hence the importance of those links.
You can improve your Website's ranking by linking to relative and highly-ranked quality Websites.