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As we all know what hyperlink actually does. Hyperlink is a tag in HTML that combines/ attach pages to the website. The story of hyperlink is not end here, if you are a blogger and you want to see your site on top pages in Google. You must have to create the backlinks of your site on top Page Ranked website or the sites called Web 2.0.
If your website link is found on other top PA websites, Google will appreciate you and increase the ranking or your website.
There are 2 types of backlinks:

1. Dofollow
2. Nofollow

Lets see what is the difference between these two attributes first.

Dofollow vs Nofollow

These are two different attributes for hyperlink tag. For the normal user it doesn't matter. But for the blogger or those who are running websites, it's necessary to know about these tag attributes.

Dofollow

It is an HTML attribute with tells search engine bots to follow the link and appreciate the link. It helps the targeted link to get good ranking in the search engines.
Dofollow backlinks are most powerful backlinks for any website which want to get good ranks in search engine.

Nofollow

Nofollow backlinks are those links that are not followed by search engine bots. It means that if you got a nofollow backlink, your site will not get any changes in ranking in search engine.

Q: How to know either the link is dofollow or nofollow?

If you want to see either the link is dofollow or nofollow, you can simply do inspect element and see the attributes.

But it takes too much time to see the link one by one either it is dofollow or nofollow. Also most of websites authors enables dofollow link in comments, so it is too difficult to see one by one site using inspect element.
Here is the quick way to see either backlink is dofollow or nofollow.

Things that you need:

1. Google Chrome / Firefox
2. Nofollow Extension - For Google Chrome or Nofollow Addon - Fore Firefox

After installing the extension, nofollow links will be highlighted as shown below.