SEO, search engine optimization, Google, free traffic, paid traffic

Before Google burst upon the scene, SEO was pretty easy, bordering on trivial. All you really had to do was keyword-stuff your page(s), and your website got good ranking. The more keyword-stuffing, the better the rank. If you discovered that you were being outranked by your competition, you just added more copies of your keywords. That no longer works (fortunately)