For years people have known that the number of links into your sites effects your rankings on search engines, such as Google (see their page on Google Friendly Sites). Thus started the mad dash to get as many links into a site as possible; through all sorts of tactics, but mainly looking for sites that had an "add a link" button. That brought the masses of spam emails of people sending thousands of emails to any address they could find requesting a link exchange. Sadly, this is still going on, even though we've found out that you need more than just a large amount of links to improve search engine rankings.
Now it is understood that is not just the quantity of links that's important, but that the 'quality' of the links is most important. The site needs to be relevant to the topic and well ranked itself to bring any value to your site. There's a long list of other considerations where there's much debate on if they are relevant or how relevant, but are at least good to keep in mind: the Google PageRank of the page, the number of links on the page, using three ...Read the full article