Backlinks serve an important purpose as they act as a ‘digital word of mouth’ for Google, which can affect how your website ranks.
There are different types of backlinks, including do-follow, no-follow and sponsored. Do-follow backlinks are the most credible as they allow ‘link juice’ to flow down from the website that provides the backlink. Link juice refers to the passing of value from one domain to another.
If their website has a higher domain authority, this can work in your favour – less so if their domain authority is lower.
No-follow backlinks don’t pass down any link juice, but can still serve a purpose by referring traffic to another domain.
Sponsored backlinks will be tagged as so if the link has been bought in any which way, in the means of a sponsored post of if the link has been paid for.
In 2012, Google released their Penguin update which aimed to penalise websites who had previously partaken in ‘black hat’ SEO tactics including manipulative link building activities such as paying for backlinks that weren’t categorised as sponsored.
This means that webmasters were trying to manipulate the search rankings so Google cracked down on this and tried to better understand the links that a website was building. By understanding this, Google can ascertain whether links were built naturally or manipulated.
In order to fix a black hat backlink strategy, webmasters were required to submit a disavow file to Google Search Console if they could not get the backlinks removed from spam websites.