Pagerank

One of the conclusions was that if the crawler wants to download pages with high Pagerank early during the crawling process, then the partial Pagerank strategy is the better, followed by breadth-first and backlink-count.

Now Google’s PageRank algorithms determine what — and how much — people around the world know about us.

PageRank was Google’s “secret sauce” metric released back in 2000.

A link-based search engine, such as Google's PageRank system, will not use the link to increase the score of the linked website if the link carries a nofollow tag.

Google's PageRank method for ordering the results has received the most press, but all major search engines continually refine their ranking methodologies with a view toward improving the ordering of results.

It is similar to a Pagerank computation, but it is faster and is only done in one step.

PageRank is thought to correlate well with human concepts of importance.

Search engine optimization encompasses both "on page" factors (like body copy, title elements, H1 heading elements and image alt attribute values) and Off Page Optimization factors (like anchor text and PageRank).

Their method crawls web pages with high PageRank from different communities in less iteration in comparison with crawl starting from random seeds.

The PageRank algorithm instead analyzes human-generated links assuming that web pages linked from many important pages are themselves likely to be important.

They found that a breadth-first crawl captures pages with high Pagerank early in the crawl (but they did not compare this strategy against other strategies).