Docker is a computer program that performs operating-system-level virtualization. It was first released in 2013 and is developed by Docker, Inc. Docker is used to run software packages called containers. Containers are isolated from each other and bundle their own application,[8] tools, 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 are thus more lightweight than virtual machines. Containers are created from imagesthat specify their precise contents. Images are often created by combining and modifying standard images downloaded from public repositories.