How Important BackLink and PageRank?

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Pagerank and Backlinks, can be described as two sides of the coin, can not be separated from one another, but each relates to each other. A website can not rank well when traffic can not work optimally. Until now, a lot of website owners, willing to spend money that does little to put the website in the first sequence in the search engines, such as: Google, Yahoo, Alexa, Ask and others. For website owners, was ranked first in the search engine will raise the level of popularity on the internet. In addition, expected to raise the level of sales, because so much traffic that led to the website. Not surprisingly, many programmers who are paid only to create an application that is so sophisticated that can increase the ranking of its clients websites.
Google describes PageRank: [4]PageRank reflects our view of the importance of web pages by considering More Than 500 million variables and 2 billion terms. Pages that We believe are Important pages receive a higher PageRank and are more likely, to Appear at the top of the search results.
Also PageRank considers the importance of EACH page That casts a vote, as votes from Some pages are Considered to have the Greater value, Thus giving the linked page Greater value. We have always taken a pragmatic approach to help improv search quality and create useful products, and our technology uses the collective intelligence of the web to determine a page's importance.