Containers, Docker and... Cats!

Containers, docker, microservices... I am pretty sure I have heard those words before, they have been pretty hardcore lately... So, this thing, "containers" what is all about? is it like a big box where you put things? would that run in Windows? is just another virtual machine? why is so "awesome"? can I fit a cat in a shoe box? I will try to explain all those questions in a simple language, about what are containers, what are they right now the sweet potato and why I should care and why in a few months you will probably be using them. Vote for this and I promise a lot of cat pictures as well...