What are “Infolinks”?

Simply put, Infolinks are embedded links to keywords in your blog or website articles, and you can even have them in web forum posts. In fact, I first came across Infolinks in use on a web forum where I am a Moderator. At first, I thought it was kind of odd, there were double-underlined words in each post, scattered here & there. When I moved my mouse over one of these underlined words, a min-pop up appeared with a small advertisement.