I don't think this is the original source (I seem to remember a blog post with better diagrams), but this post [0] does a good job introducing pieces you need a

I don't think this is the original source (I seem to remember a blog post with better diagrams), but this post [0] does a good job introducing pieces you need as your number of users increases. It is specific to Amazon, but the concepts are universal. [0] http://highscalability.com/blog/2016/1/11/a-beginners-guide-to-scaling-to-11-million-users-on-amazons.html http://highscalability.com/blog/2016/1/11/a-beginners-guide-...