The difference between site:xxx.com and site:www.xxx.com

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Many seoer have this question, that is, in site:xxx.com and site:www.xxx.com when the results are different, sometimes the number may be a lot worse.

This problem if carefully read the Google Webmaster's introduction will have some understanding, but not very obvious, but with another way of expression: the site domain name xxx.com and www.xxx.com in both cases, Google will give different PR value.

In fact, the meaning of this sentence is that Google will give a different understanding of these two situations, the reason is also very simple, most of the two addresses visited are the same, but in the external publicity, people use the link is different, some people like to have www, some people do not like, The result is that these two domain name format is to treat the same site, but the quantity and quality of the chain is a world of difference, not a few people do outside the chain will be used in both formats?

It is well known that the PR value is decided by the chain, the two have a different domain name, PR is a natural thing, and the PR value to a certain extent determines the search engine to a site's crawl access frequency and depth, in other words, the search engine on the two domain name is not as a treatment, The two domain names will be stored in the data separately and not unified, resulting in a difference in search results.

For the search engine why do I do some conjecture: the first is that although most people's Web site has no WWW is the same station, but there are some sites have www and no www is a different site, so that the search engine has a certain degree of difficulty; the second search engine has 2 domain names treated as a separate site And this mechanism and the first issue of the combination of the search engine on whether there is a WWW and whether the same site is more difficult to judge, once there are any errors, then the search engine may be the results of a huge impact.

Summary of the statement: We do outside the chain when the same as with the accomplice crime, keep the caliber (path) Unified! For example: www.zzyoua.cn keyword is! Do it as much as possible when you do it!