Search engines have special algorithms to measure the popularity and importance of a website. The Google PageRank is an algorithm that measures the popularity of a linked document, e.g. a web site, based on the number and quality of links (e.g. natural links) that point to it. The basic idea is the simulation of a human surfer to determine the realistic likeliness of a site being hit.

The PageRank is an important factor for the ranking of a web site. Originally invented by the founders of Google, other search engines copied the concept in the meanwhile, e.g. in form of Bing's Page Score.

• Natural Growth Rate
• Inbound Links Increase Ranking
• Outbound Links
• Link Exchange Strategies
• Links From Spam Sites
• On-Page SEO