Do follow back links?

Dofollow backlinks are links to your website from other sites that the search engine can actually ‘jot down’ as points in your favor. The more sites you’ve got dofollow-linking back to you, the more “link juice” you have, and the higher your web page will rank in the search engine results page.

For More Information Please Refer: https://www.quora.com/What-is-a-do-follow-backlink