https://medium.com/@devon_campbell/why-should-i-care-about-docker-7a6bbe12856f

Docker is a new approach to virtualization. If you understand virtualization, feel free to skip the next section. If not, you’ll need a basic understanding of virtualization before I can help you understand Docker.

Let’s start with a metaphor: imagine you own a house. You have a friend who needs a place to say. You have a few options if you want to help out your friend.