Docker, what does it do actually?

I have watched a couple of scary confusing presentations https://www.youtube.com/watch?feature=player_detailpage&v=Av2Umb6nELU and https://www.youtube.com/watch?v=Q5POuMHxW-0 without being able to understand anything. Why you guys don't stop trying to be smart weird and funny and just try to be educational.



Finally I stumbled upon this BRILLIANT presentation :



by Ken Cochrane https://github.com/kencochrane (thank you Ken, you are a God!) which shows you in a very effective way what Docker does and how to use it.



You should also go through the very nice hands-on tutorial https://www.docker.com/tryit/



I am not sure yet how to take advantage of Docker, but surely it's a very impressive technology!

More reading here on the internal working of Docker http://stackoverflow.com/questions/16047306/how-is-docker-io-different-from-a-normal-virtual-machine