Using rel= "nofollow" to protect the outer chain

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The "nofollow" attribute can appear in the META tag and page link properties of a Web page to tell the search engine crawler "do not track links on this page" or "do not track this particular link", a property that is useful for search engine optimization. You can guarantee that the weight of your Web page will not be reduced by malicious messages or other links.

Why use "nofollow":

The "nofollow" attribute tells the search engine not to track such links, of course, it will not send the PageRank value of your Web page, so that you can ensure that the links in your Web page is "clean" and trustworthy, such as you want to tell the visitor a URL, but this site may be garbage stations or bad content, This is the time to use the "nofollow" attribute, to protect your outer chain. At present, both Google and Yahoo support the recognition of "nofollow".

How to use "nofollow":

1. In the meta tag of the Web page, add the statement "nofollow" so that the search engine will not be tracking all outgoing links on the page, the code is as follows:
<meta name= "Robots" content= "nofollow"/>

There are other similar statements such as:

Index: The page will be retrieved; (Let Robot/spider log in);
Follow: Links on the page can be queried;
NOINDEX: The page will not be retrieved, but the link on the page can be queried;
Nofollow: The page will not be retrieved and the link on the page can be queried. (Do not let Robot/spider follow this page of the link down to find).
Nosnippet: Do not display descriptive text in search results.
Noarchive: Do not show snapshots.
NOODP: Do not use titles and descriptions in open directories.

You can choose according to your actual needs.

2. Add "nofollow" to the links in the Web page, tell the search engine not to crawl a particular link, this option is more flexible than the META tag, you can set the specific link, the code is as follows:
<a href= "example.html" rel= "nofollow" > Example </a>

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