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This article mainly introduces what rel nofollow means, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

What does nofollow mean?

Nofollow is an attribute value of the html tag, Google recommends using nofollow, telling the machine (crawlers) that there is no need to track the target page, which means that spiders are prohibited from crawling and passing weights, but if you are submitting the page directly through sitemap, the crawler will still crawl, the nofollow here is only the current page's attitude towards the target page, and does not represent the attitude of other pages to the target page. Usage: rel= "nofollow", originally to reduce the impact of spam links on search engines, because the link left in the comments page, the webmaster is not sure where the link points to, do not know if it is a spam link, so generally use rel= "nofollow" to prevent spiders from crawling.

In recent years, we often see attribute definitions such as rel= "nofollow" or rel= "external nofollow" in website links, and many friends do not understand their semantics. Today Yuanyuan will give you a detailed analysis of the usage of the attribute rel in the web page.

The rel attribute is used to describe the relationship between the link and the page that contains the link, as well as the target to which the link is opened. It has many attribute values, such as next, previous, chapter, section, and so on. What we have seen for a long time now is the application of rel= "external nofollow" and rel= "nofollow" parameters.

First let's talk about Nofollow.

"Nofollow" provides a way for webmasters to tell search engines "do not track links on this page" or "do not track this particular link". Initially, the nofollow attribute appears in the page-level meta tag, instructing the search engine not to track (that is, crawl) all outgoing links on the page. For example:

The use of nofollow

Nofollow can be used in two ways:

1. For meta meta tags:

Tell the crawler that all links on this page do not need to be tracked.

two。 For a tag:

Log in

Tell the crawler that the page does not need to be tracked.

Let's talk about external nofollow.

Rel= "external nofollow" is just a little more formal than the rel= "nofollow" parameter. Rel= "external nofollow" and rel= "nofollow" have made it very clear that the functions of Chinese translations are "do not read" and "external links should not be read". In fact, rel= "external" is just an alternative to target= "_ blank" attribute. The property of target= "_ blank" is to open a new window. But because some blogs use strict DOCTYPE reputation, if you open the source code of the website, you can see it on the first line:

In this case, target= "_ blank" may fail, so the parameter rel= "external" is used instead, so we can see that the property of rel= "external" is just to open a new window.

From the above instructions, you should understand under what circumstances you can consider using nofollow? The following is a list of situations where nofollow is frequently used:

Untrustworthy content

Paid link

Grab by priority

The role of nofollow

Nofollow has three main functions:

1. To prevent untrusted content, the most common are spam messages on blogs and comments in order to get spam links outside the link, in order to prevent the page from pointing to some pull pages and sites.

two。 Paid links: to prevent paid links from affecting Google's search results rankings, Google recommends using the nofollow attribute.

3. Guide the crawler to grab effective pages: prevent the crawler from grabbing some meaningless pages, which affects the efficiency of crawling.

PR pruning (Pagerank Sculpting)

The abuse of nofollow, some SEO in order to achieve the maximum search engine optimization, through nofollow to control the flow of PR, can be very good to optimize some specific pages. Of course, this optimization is more suitable for some old sites that have accumulated a considerable amount of PR. In order to prevent PR pruning and abuse of nofollow, Google has weakened the role of nofollow, the previous nofollow not only will not cause PR flow, but also will not cause PR loss, although the current nofollow regulations will not cause PR to flow to the target page, but the original flow of the target page will be lost. For example, the current page PR is 1, and there are 10 links on the page, one of which is a nofollow link, according to the previous nofollow, each non-nofollow link to the target page will get a PR of 1 nofollow 9, a link with nofollow can not get PR, and according to the new regulations of Google on nofollow, the target page of non-nofollow links can only get a PR, that is, a loss of 1max 10 PR.

What is the difference between nofollow tags and meta robots tags?

The nofollow tag forbids spiders to crawl to track this link, while the meta robots tag forbids spiders to crawl to track or index the entire page link, the scope of the limit is different, you can choose to use it as needed.

SEO recommendation

The role of nofollow in Google has been very weak, so SEO can only rely on manual review to control the flow of PR on the site and avoid links to spam pages.

Thank you for reading this article carefully. I hope the article "what does rel nofollow mean" shared by the editor will be helpful to everyone? at the same time, I also hope you will support us and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

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