What does docker exec do?

The function of the docker exec command is to run a command inside a running Docker container. This capability allows users to interact with the container’s environment and execute processes as if they were operating directly within that environment.

When you use docker exec, you can specify the container in which you want to run the command, as well as the command itself. This can be particularly useful for debugging purposes or for administrative tasks, such as checking configurations or manipulating files within the container. It's a powerful tool for managing running containers without the need to start a new container instance.

Other actions related to Docker containers, such as executing new applications or creating new container instances, involve different commands, such as docker run, which creates and starts a container, or docker stop, which terminates a running container. The distinct purpose of docker exec sets it apart, highlighting its role in enabling command execution within an active container environment.