Search Engine Optimization or SEO is a process of making your site more friendly in order to help search engine crawlers find and rank your site above millions of other sites having similar content. There are tens of thousands of articles available in the net for literally every topic you can think of. Hence besides the content of your site it is of equal importance that how you make it search engine friendly – this process of optimizing your site for search engines is called Search Engine Optimization.
SEO not only helps you to optimize your site but also helps to get a quality traffic from organic search which is highly recommended for advertising programs like AdSense. Of course a bit of one time work from your side is required which will yield a great return in terms of traffic to your site.