How search engines Arrange Web pages

third, how the search engine arranges the Web page

Search for anything with your favorite search engine, and the search engine almost immediately picks up the ones that match your theme from millions of of the pages he knows to appear on your screen. These pages are arranged in a certain order and the most relevant are at the front.
But the search engine is not a librarian, he is not able to repeatedly ask questions to better locate the target of the search, also can not rely on intelligence judgments and past experience to arrange the page, and people can do. Intelligence is the direction of development, but there is still a long way to go.
So how does a search engine determine relevance? They rely on a set of rules, the main rule is the location and frequency of keywords in the page, we call this "position/frequency method."

1, location and frequency

(1), location
If you go to the library to find books on tourism, the administrator will first look for books on "Travel" in the title. Search engines are the same, the keywords (that is, "travel") appear in the title of the page is more relevant than the title of the page does not appear in the keyword.
Search engines Also check whether keywords appear at the top of the page, such as in the title of the article or in a few paragraphs ahead. They think the pages related to the search topic will start with those words.

(2), frequency
Frequency is another major factor of relevance. Search engines analyze the frequency of keywords in the page relative to other words, and the higher the frequency, the more relevant.

2, the search engine in the arrangement of web pages there are certain differences

All search engines have the three basic parts mentioned above, to some extent conform to the "position/frequency method", but there is a difference in the implementation, which is why we use different search engines to do the same search results will produce different reasons.
First, some search engines will index more Web pages than other search engines, and some will update indexes faster than other engines, so it is not possible to collect identical Web pages in search engine indexes.
Second, for some reason, some search engines may also have precedence over the arrangement of certain Web pages. If excite uses link popularity as a factor in arranging web pages, he knows which pages in the index have many links to them, and he gives these pages a small reward for arranging them in a proper advance. This is also reasonable, because the more links you have to them on the Internet, the more important these pages are.
In addition, some hybrid architecture (search engine and directory coexistence) of the search engine may be in those directories already exist in the site of the front page, the reason is that a site is good enough to be placed in the directory, there should be more opportunities than those not listed in the directory of the site before the page.

Finally, many web page designers mistakenly believe that "meta tags" is the secret of referring a Web page to the top of the list, and that some search engines actually have keywords pages in the META tags, and some search engines don't read at all. Meta tags ". "Meta tags" is one aspect of solving the problem, but it is not a necessary secret weapon.