Types of Backlinks
dofollow Links, tells engines that “the content on the other end of this link is important and should be noted. These are the most valuable links as they pass PageRank.
nofollow Links, are ignored by search engines algorithms in most cases, meaning they’re less valuable for SEO.
sponsored Links, marks links that are advertisements or paid placements.
ugc Links, marks user-generated content (UGC) links, such as comments and forum posts, with the ugc value.