PageRank is Google’s stamp of importance which every site receives. PageRank is measured from numbers 1-10: 10 being the most important, and 1 being the least important. What you’re trying to aim for is a decent PageRank for your blog; the higher your PageRank, the more you benefit from it.

In a nutshell, getting several “.gov” and “.edu” backlinks will contribute to your PageRank tremendously, more then just a regular link, or PR6 link for that matter.