CMO Magazine has a nice introduction to anyone new to search engine optimization (SEO) . All-in-all, the article does a good of explaining the basics. Juan Perez writes: “SEO is the attempt to modify something about your website to improve the quality of your organic or algorithmic rankings at the big search engines.”
If I may add my two cents, SEO has nothing to do with meta tags, link building, or even pay-per-click advertising. In short, it’s coding your website in a manner than computers can understand and better archive your site content for searching.