Page rank is where a web site places on the pages of search engine results. The search engines use algorithms to determine the importance of a page and where it will place.
Algorithms are mathematical formulas that use data in a complex series of steps. While the algorithms can be simple or very complicated they turn numbers into usable language. The factors considered by the algorithms to rank a page are estimated to be over 175.
Search engines are working around the clock to crawl web pages and index them. As pages are compared to other pages and every link is weighed, the complexities are mind boggling. You can see some of the results on search result pages. These include a relevancy score which shows how the search engine ranked the pages on the results page, the page title, a brief description, and the total number of relevant pages found which can number in the millions.
Websites strive to get better page rank, or page placement within the search results. Better page placement or page rank usually means more visitors. These search results are called natural or organic because the website did not pay to be there but was placed there by relevance and importance. Website marketers practice SEO (Search Engine Optimization), which includes keyword research, and SEM (Search Engine Marketing) to achieve better page rank.
Most search engines are making money through advertising and searching is free. Most of them earn money through PPC (Pay Per Click) advertising. These show up as sponsored listings on a search results page.
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