In the dawning of the net people needed a way to get their website out to the masses. Google stepped on the scene and made this a very real possibility with adsense and other valuable tools incorporated into the Google format.
These days when writing an seo blog, or search engine optimized blog the trick is to write it so that it is both high quality and complies with Google’s format for easy crawling. Search engines often crawl every page on the web then collect statistics on your page that they pass on to their database for analysis. If your page meets the right standards of quality and keyword contents you get higher ranking on the search engines.