If you’re inquisitive about the history behind how “SEM” came to imply “PPC” at the exclusion of Search engine optimization, you'll be able to dig further in these posts: Par­courez cette liste à la recherche de sites ressem­blant à des annu­aires per­ti­nents et ajoutez‑y votre site.  Video Sights- It's for someone https://www.seoclerks.com/Link-Building/2415629/30-Days-Affordable-SEO-For-Your-Website-with-Web-2-0-and-Profile-Backlinks