Containers is a technology developed by Docker and has been embedded into Windows 2016 as well as Public Azure. The technology provides a portable, isolated configuration environment for applications. A container can be configured for an application and then that container can be deployed to any Docker compliant server.
Docker containers wrap a piece of software in a complete filesystem that contains everything needed to run: code, runtime, system tools, system libraries – anything that can be installed on a server. This guarantees that the software will always run the same, regardless of its environment.