I'm not an SEO expert, and I've only been working in the Internet marketing and Search Engine Optimization business for about a year now (one year next month!), but this infographic really explains a lot about what we do where I work. Right now, I've been mostly managing the content for our sites, but part of what I do is making sure that search engines, like Google, can find the articles that we post to our sites by using SEO techniques. I can't say what we do or how we do it, as that would sort of be like exposing trade secrets--which is somewhere in that fifteen page document I signed when I started work--but knowing a little bit about how Google actually finds stuff is helpful to that aspect of how I do my job.
I just thought it was interesting, and in such a world in which we rely on Google to tell us pretty much everything about our world, I thought some of you might find it interesting too.
Google it. If Google doesn't know, no one does. Or you suck at searching.