Docker Daemon (dockerd):

• This is the background service that manages Docker objects like images, containers, networks, and volumes.
• It listens for Docker API requests and executes them.
• Essentially, it's the engine that powers Docker.

Docker Client (docker):

• This is the command-line interface (CLI) that users interact with to issue Docker commands.
• It sends these commands to the Docker Daemon via the Docker API.
• So, when you type "docker run," the client sends that request to the daemon.

Docker Images:

• These are read-only templates that contain instructions for creating Docker containers.
• They include everything needed to run an application: code, runtime, libraries, and settings.
• Think of them as blueprints for containers.

Docker Containers:

• These are runnable instances of Docker images.
• They are isolated environments that can run applications consistently across different infrastructures.
• Containers are the actual running applications.

Docker Registries:

• These are repositories for storing and distributing Docker images.
• Docker Hub is the default public registry, but you can also create private registries.
• When you use "docker pull," you're retrieving an image from a registry.

Docker Networking:

• Docker networking allows docker containers to communicate with each other, and with the outside world.

Docker Volumes:

• Docker volumes are the preferred mechanism for persisting data generated by and used by Docker containers.