3.PageRank algorithm: PR algorithm, I believe we are very familiar with, also is the chain.
1. frequency position Weighted Sorting Algorithm: as the name suggests is that from the entire site on the position of the text and the number of sorting, first look at the location of the site keywords in different content and appears in the title when the difference is very large, the search engines that can show the title of a web site is dry what, if the title which appeared far more important keywords keywords more than the inside. This is now we all know the title of a web site is very important is derived from this algorithm. The number again appeared, one word at a website or a page in the number shows its stronger correlation, this statement is a method of automatic indexing Luhn first put forward, is that everyone is the keyword density in the surface evolution algorithm. The limitation of frequency position weighted sorting algorithm is only pay attention to the words in the performance of the site and go to a website ranking, this algorithm is the first search engine is mainly used, when the title on the site in Webmaster content in what Keywords even picture ALT hard making up words, the more the better ranking stack.