Docker
Docker offers free plans for individual developers and teams just starting out. We also have new monthly plans for teams of developers with more advanced requirements
Docker is a set of platform as a service (PaaS) products that use OS-level virtualization to deliver software in packages called containers.
Containers are isolated from one another and bundle their own software, Libraries and configuration files; they can communicate with each other through well-defined channels All containers are run by a single operating system kernel and therefore use fewer resources than VM