What is Dofollow link?

There is no dofollow tag to add. The word exists only as the opposite of nofollow. If a link carries no special attribute, search engines treat it as a normal recommendation and pass some credit along.

That credit is why people chase links from respected sites. A dofollow link from a publication your industry actually reads tells search engines that someone with a reputation vouched for your page.

You cannot control how other sites link to you, and forcing it goes badly. Publish something worth citing, then let editors link however they want. A nofollow link from a real audience still sends real readers.