Docker is an open-source engine that automates the creation of applications as lightweight, portable, and self-contained artifacts. These can be deployed independently of the host and environment configurations.
Docker containers are the standard for modern application architecture design. Application and system packaging for DevOps have created templated server deployments that are portable across operating environments (on-premise, hybrid, and public cloud provider).
Docker is the de facto container format standard for most implementations in the Linux Container movement. It is an important technology in DevOps and cloud automation strategies.
Docker is an industry leader, and their technology is integral to container solution providers including Google, AWS, Azure, and RackSpace.