What is Google Page Rank ?

Google’s Page Rank :

We often hear about the Google's Page Rank. Let us see what is Google Page Rank in some quick and short overview given below :

PageRank is an algorithm patented by Google. It was invented in the 1990s by Larry Page and Sergey Brin. PageRank implements the concept of link equity as a ranking factor. Each page linking to another page increases the PageRank of that other page. But it is out of date algorithm. PageRank is just one factor in the collective algorithm Google uses when building SERPs. It may be possible that a page with a lower PageRank ranks above one with a higher PageRank for a particular query. Building relevant links will contribute to a higher PageRank. Google attempts to detect and devalue irrelevant links that are probably used to manipulate it.