Google PageRank (GPR)– a link analysis algorithm 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. Value- from 0 (not known site) to 10 (very very popular). Partly depends on content and amount of backlinks One link from
www.nasa.gov to your page is more than, ten from
politika.apiemus.com. But not forget to work with <TITLE>. If you forget to use some keywords, GPR will not help.
Alexa rank (Alexa Rank, AR) - amount of traffic. Lower AR, better traffic. amazon.com (rank 14); weather.com (rank 64); cnn.com (rank 26); google.com (rank 5); Yahoo.com (rank 1). These rankings are generally consistent with the amount of traffic they have. It begins from 10 000 000.
BackLinks (BL) – Backlinks (or back-links (UK)) are incoming links to a website or web page. In the search engine optimization (SEO) world, the number of backlinks is one indication of the popularity or importance of that website or page (though other measures, such as PageRank, are likely to be more important). Outside of SEO, the backlinks of a webpage may be of significant personal, cultural or semantic interest: they indicate who is paying attention to that page.
Thoose 3 are good, but better to explore
Webmaster Tools to optimize your site. It is unvaluable tool. Additionaly read
this article of experts.
Check your web site SEO popularity: Google PageRank and Alexa Rank. It will take about 10 seconds.
