When Search Engines rewrite their algorithms to determine who will appear at the top of their engines, "Link Popularity" has now become a key determining factor in Search Engine placement.  It's not how many sites you link to; it's a matter of how many sites are linked to each other.  You can link to 10,000 websites, but if only 1 links back to you, the Search Engines only count this as 1 link.  The more incoming links that a website has pointed to it; the higher it will rank on the Search Engine.  This benefits both your website and ours.  The higher the rankings in the Search Results, the greater the number of visitors to potentially find your site.  So when another website links to your website it is a signal to the search engine crawlers that your website is worth visiting.