No follow is a link attribute that instructs spiders not to crawl the particular backlink on the webpage. Hence these links are never indexed in search engines. They are only used to build traffic from various external webpages.
They don't help you to boost Page Rank, website rankings and have no SEO value. It is a notice for search engine not to count a link. The Nofollow tag can be good for SEO – most webmasters use this tag not to follow untrusted content. ... But it depends on where the link is placed and the quality of it.
Nofollow Links Won't Hurt You Unless You Are Spamming At A Huge Scale. ... That being said, while most cases are that links that have the nofollow attribute on them will not negatively impact your rankings in Google.