It’s no secret that WordPress websites attract tons of spam comments, comments that often make no sense whatsoever.
A reputable anti-spam plugin such as Akismet does a really good job at filtering these out, so that you don’t need to waste your time moderating them.
But WordPress websites, especially the ones with a decent level of accumulated authority, also attract comments that aren’t necessarily spam.
These non-spam comments exist because the commenters are hoping to land a backlink to their own website through the website URL field in the comment form.
To minimize these types of comments, WordPress bloggers can choose to have the URL field removed.