Why Are There Two Types of Hyperlinks?
In the older days of SEO, receiving a backlink from any website, counted positively towards your SEO score. People were building backlinks everywhere on the internet, and spamful links were becoming too common. Google decided to implement the "No Follow" html link. The "No Follow" link meant your website link, would not be counted towards your SEO score. This protected website owners from being spammed with unnecessary links.