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PageRank is a link analysis algorithm, named after Larry Page, used by the Google Internet search engine that assigns a numerical weighting to each element of a hyperlinked set of documents, such as the World Wide Web, with the purpose of "measuring" its relative importance within the set. The algorithm may be applied to any collection of entities with reciprocal quotations and references. The numerical weight that it assigns to any given element E is referred to as the PageRank of E and denoted by PR(E).
Google Search
Google Web Search is a web search engine owned by Google Inc. and is the most-used search engine on the Web. Google receives several hundred million queries each day through its various services.
Page Rank checker is a free tool to check Google page ranking of any web site pages easily and to display your site's PageRank value on your web pages

Pagerank is the general algorithm of Google which ranks a site on the basis of its back links. In fact the main element of allocating a Pagerank to any webpage is the number of sites linking to the webpage and their own Pagerank value. This can also be taken as a popularly contest between high interest sites.