Do-follow Links vs No-follow Links

In search Engine Optimization the most common words are nofollow and dofollow links. This article will be useful for the SEO beginners to know how these links are important for the websites.

What is a DoFollow Link?

 Dofollow links allow spiders to follow a link. If you want to crawl a site by search engine spiders you can guide them with this dofollow links. The URL for the dofollow link is:
Anchor Text

We have to just add a special HTML markup inside the URL rel="dofollow" to the basic URL format. It is optional to use this attribute in the url. The url without dofollow attribute can also be crawled by search engine spiders.
The only benefit with this dofollow links is you can increase the Google page rank.

What is a NoFollow Link?

If you don't want to crawl a link by search engine spiders, you use this nofollow links. The main idea behind the nofollow links is to cut down on link spam. The URL for the nofollow link is,
Anchor Text

Thus, nofollow link is a link that search engine spiders cannot follow, as a result some SEO benefits won't be transferred to that link.
Placing a nofollow link at the top of the page has the more impact than placing it at the bottom of the page.

Types of No-Follow:
Robots Meta Tag: The URL is:                            

This means a search engine spider does not follow the links on the whole page.
Link Attribute: The URL is:
  
  This means search engine spiders not to count the link in terms of ranking pages.

Do-follow Links vs No-follow Links: