This code snippet removes the “Website” field from the WordPress comment form. Therefore, when commenting, readers will not be able to enter a URL. I use this code on a lot of my projects because, most of the time, my clients’ readers don’t have website and this field is pointless. It also helps deter spammers when they see there’s no field to enter their spam site.
See here to learn how to prevent the comment-author’s link from displaying.