Backlinks are incoming links to a website or web page. Inbound links were originally important (prior to the emergence of search engines) as a primary means of web navigation; today their significance lies in search engine optimization (SEO). The number of backlinks is one indication of the popularity or importance of that website or page (for example, this is used by Google to determine the PageRank of a webpage). Outside of SEO, the backlinks of a webpage may be of significant personal, cultural or semantic interest: they indicate who is paying attention to that page.
In basic link terminology, a backlink is any link received by a web node (web page, directory, website, or top level domain) from another web node. Backlinks are also known as incoming links, inbound links, inlinks, and inward links.
What is do-follow and no-follow ?
Not all backlinks are equal. If the links use the nofollow tag or redirects, like a lot of sites do, they are worthless in the eyes of Google for passing on pagerank. The nofollow tag will be inside the a href tag. A redirect will be in the form of a dynamic url.
The reason why sites use nofollow or redirects is because in Google you give away a certain amount of pagerank through your outlinks on the page. Webmasters want to keep the pagerank flowing to their internal links, to keep those internal pages’ pagerank on their site high. They also don’t want to give their competitors an edge in the search engines by passing on “credit” to them too. So they nofollow everyone else. Most don’t realize that many forums and blog software automatically puts a nofollow in your signature and comment links.
Where to get hundreds of free Backlinks ?
1) Commenting on blogs that are part of the no “nofollow” blogging movement. Hint: This blog is a dofollow blog
2) Forum signatures that don’t have nofollows. Here is a list im keeping of Do Follow Forums
3) Link exchanges
4) Creating a network of your own websites and cross-linking (just make sure each site has different I.P addresses)
5) Submitting to SEO friendly directories