Page Rank of the linking page, one of the most significant factors, which determine how much precious importance is passed on to your page. The higher the Page Rank of the page linking to you, the higher the value you obtain.

Each link to your Web site is measured a vote. If your neighbour states in public that you are very reliable, or that you are his best friend (Google Page Rank 2), this is of course a less significant vote than when the President of your country says the same (Google Page Rank 9).