PageRank

Google PageRank is the method followed by Google for calculating a webpage’s importance and relevance depending upon the number and quality of sites linking to it. PageRank is named after Google's co-founder Larry Page.

Google ranks all the sites that it indexes on a scale of 0 to 10. The higher the rank, the higher is the chance to get placed in the top of listings in the Search Engine Pages for the relevant searches.

Example:

I have a site based upon search engine optimization techniques. If I have wonderful content and good number of backlinks, then there are chances that Google will award a good rank to my site. Suppose that my site is ranked as 9 by Google. That means if someone searches the Google for search engine techniques, the chances that my site is shown in the top 5 search results of the first page of search engine result pages are higher.

Now if someone searches for comics, though I have a page rank of 9, I will not be shown in the search results as my site is not relevant to comics.

Hence, Google not only checks the page rank, but also relevancy of the page to user’s keyword along with different other factors which Google keep as secret.