Many search engines, are starting to use site popularity as a way to rank your site. In other words, a site with 100 links to it will rank higher in the search results than a site with only 10. If your site link 'popular site' with high Page Rank you get high rank in search engine result.
The Google PageRank is the implementation of the link popularity concept in the algorithm of the Internet's most popular search engine, Google. The PageRank is a number between 0 and 10.
There is strong evidence that PageRank is the main factor that gives a webite's positioning in the results pages. To increase your PageRank, you should get as many external links as possible pointing to your homepage. The links should be from pages with high PageRanks. It seems that a link from a website with PageRank zero (most of link pages are zero PageRank in most of site!!) is less worth than a link from a page with PageRank 4 or 5. You can get increase Page Rank by exchanging link with similar Page Rank pages and can get next higher Page Rank. So it better to exchange link with early pages with high PageRank.
Other impotent factor is that if your link is located among lots of links (as example in a link page among 100s link) it is less chance you get improvement in your PageRank with that link. So it is always better to get link from home page or 'early' pages.
Beauty of this program, if you have more web sites with different Page Rank you can get low rank web site listed in high rank site with providing links to others in your high rank page.(Impotent!! It will not low down you Google PageRank of that page even you provide link to low rank site) Submit you home or main pages with Google Page Rank Here . We will provide an exchange sites.