Share the role of each label directive in SEO optimization

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Search engine optimization in different labeling instructions play a different role, through the major command webmaster can be like search engines and users to display different content, reasonable use of the instructions can help the webmaster better operation site, but if not clearly know the role of instructions, often will bring adverse impact on the site. Share some common label instructions.

Robots file instructions: Spiders to Web site access will first access the robots file, the file must be placed in the root directory, the file name must be lowercase, used to control the content of the site can be spider access or prohibit access. For example, you can block the site's background management, scripting language, duplicate content indexing, or some non-public pages on the site. In the file is blocked pages, spiders will not be crawled, and there is no weight on the transfer.

Allow directives: about the Allow command can support the search engine only Google, Yahoo and ask, use this command can clearly tell the search engine can crawl the site in which directories and pages, if the site needs to block a large number of pages, can not be listed in the robots file, At this time and can consider the use of allow instructions to facilitate the spider faster crawling site.

Disallow instructions: Put in a robots file can prevent search engines to visit the Site page, the website in the official line before the use of disallow instructions to screen search engine spiders crawl, lest unnecessary crawling caused site to be punished. The directive is to prevent crawling but does not block the index, if there are links in other sites that are blocked in the site,

Canonical directive: This label is by Google, Yahoo first introduced label, used to identify and deal with duplicate content, standardize website version information, the use of the label is relatively simple, the property is similar to the URL of 301 Redirect, but the nature is different. The appearance is to tell the search engine all the other versions of the weights are down to the defined URL, but in fact did not jump the different version of the URL to the definition URL. After Baidu search engine also began to support the canonical tag, the label used simple but can not write error syntax, or cause the search engine error to judge the content of the site.

NOINDEX Tags: the page marked as NOINDEX will be completely excluded by the search engine, spiders encounter the site to add NOINDEX instructions, will still crawl the page, and the weight can be passed to other pages, but crawling crawl content will not appear in the search engine index. Unlike the Nofollow property, it still passes weights to other sites, but they will not appear in the corresponding rankings, such as the site "site map" page does not want to get a certain ranking, but I hope this page can pass the appropriate weight to the chain site, then you can consider adding NOINDEX instructions, Instead of adding nofollow, this prevents the page from passing the link weight.

NOODP Tags: This label is mainly used for Google, Yahoo, Bing search engine optimization, when the site is included in the directory, the search engine will crawl the title of the Open Directory as the site title, and not to crawl the title of the site skills, grab the headline may be the webmaster himself want, You can then use the NOODP tag to force the search engine to crawl the site itself. The code can be directly placed in the head section, the simple wording is as follows:.

Meaning label instructions are common in SEO optimization, loudi Talent Network (http://www.0738rc.com) to share with the webmaster, summed up the imperfect place also hope the webmaster proposed, we share the learning.