About

The daemon is:

• a self-sufficient runtime for containers.
• a background service running on the host that manages building, running and distributing Docker containers.

The daemon creates and manages Docker objects, such as:

• images,
• containers,
• networks,
• and volumes.

The Docker daemon (dockerd) listens for Docker API requests. A daemon can also communicate with other daemons to manage Docker services.

See Docker - Architecture

Articles Related

Documentation / Reference

• https://docs.docker.com/config/daemon/
• https://docs.docker.com/engine/reference/commandline/dockerd/