Docker
Automate Docker Deployment with Dokku
Docker is a piece of software to simplify the creation, deployment, and execution of your applications by using containers. Containers allows you to package your application outside of your operating system environment. Instead of running different apps on different machines, you can run your container inside your machine without screwing up your operating system.
Its just like Virtual Machine. But the big difference is that Virtual Machine have a full OS with its own memory management installed. On the other hand, Docker containers are executed with the Docker Engine rather than hypervisor. Therefore, Docker containers are smaller and faster than Virtual Machines.