Google is by far the most important search engine on the net. To rise to the top of their search engine, you need to improve your link popularity and you need to understand how they measure your link popularity (over 50% of all search engine traffic comes from Google, and if you can rise to the top, you will likely rise to the top of all the other search engines as well).

Link popularity is defined as the number of sites that are linking to your site. Some websites have thousands or even millions of sites linking to them, while others might have only a few. The search engines use the number of inbound links your site has as a measure of how important your site is, which translates into your search engine ranking.

The actual number of links to your site is not the only variable used to calculate your link popularity. The search engines also examine the relevance of the links to the subject matter of your site. For example, if a website that sells vitamins has 4,000 inbound links, but the source of most of the links are websites that have nothing to do with vitamins, then the algorithm that search engines use to determine link popularity will take that into account, and the link popularity score will not be very good.