PageRank shows a websites relative importance within the world wide web.
Backlinks are incoming links to a website or web page. In the SEO world, the number of backlinks is one indication of the popularity or importance of that website
WHOIS is a query/response protocol which determine the owner of a domain name, an IP address, other details of a domain
The keyword rank of a website on a particula keyword determines the position in which the websites appears when a search is done in that keyword
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