If you are interested in “How Things Are Done” then you maybe have thought about how some of the bigger websites work.
For a small, private website with a low number of page hits you don’t need big fancy systems. One server or even a virtual server can be enough.
But what happens when you need to provide video-streaming like in Youtube, Daily Motion etc or all kinds of different services like you see them on Facebook? On the website http://highscalability.com/ you can have insight in some of those services. There’s a number of interviews with those people behind large websites. You get an idea what kind of problems can occur when you have more visitors on your website.
Have a look and enjoy.