Jean-Baptiste Quéru describes the depth and complexity of what happens when you visit a website -- there's a lot more going on that most people realize. I'll quote the very first bit, but read the rest if you're interested in getting a glimpse of the magic behind our technology. As Quéru writes, no one person or company can fully comprehend it.
You just went to the Google home page.
Simple, isn't it?
What just actually happened?
Well, when you know a bit of about how browsers work, it's not quite that simple. You've just put into play HTTP, HTML, CSS, ECMAscript, and more. Those are actually such incredibly complex technologies that they'll make any engineer dizzy if they think about them too much, and such that no single company can deal with that entire complexity.