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Docker Engine is an open source containerization technology for building and containerizing your applications. Docker Engine acts as a client-server application with:

The CLI usesDocker APIs to control or interact with the Docker daemon through scripting or direct CLI commands. Many other Docker applications use the underlying API and CLI. The daemon creates and manages Docker objects, such as images, containers, networks, and volumes.

For more details, seeDocker Architecture.

Licensing

The Docker Engine is licensed under the Apache License, Version 2.0. SeeLICENSE for the full license text.

However, for commercial use of Docker Engine obtained via Docker Desktop within larger enterprises (exceeding 250 employees OR with annual revenue surpassing $10 million USD), apaid subscription is required.