What is Disqus?
You can read more about Disqus on their website at https://help.disqus.com/customer/portal/articles/466179-what-is-disqus-
Disqus is a separate (third party) commenting system that is used by many sites around the world to allow visitors to comment on website pages. Once installed, it allows users to register for an account (or login through an existing social media account) and comment on your website.
Disqus is also very easy to install, and we've built all our themes so that all you need to do is install your Disqus code and Disqus will be automatically activated on your website.
For information on how to activate Disqus on your website, please read this article.