What is the semantic Web?

I seem to be asked this question on a daily basis mostly in reference to Google now using RDFA and Drupal 7 efforts to put RDFA in Drupal Core (IO1 is sponsoring ;-). The answer is not a simple one liner so I am constantly struggling to come up with a concise unifying statement that allows me to explain it to anyone. No luck yet so here's my current best effort at it.

In the first of the Drupal Seo series I went through basic Drupal SEO with no additional modules installed. Now we are going to move onto SEO Statistics and Analysis and how to set yourself up to win, things get a bit more in-depth (not a lot) as you will need to now install a couple of modules and connect up some external services.