At first, I thought it is automatically managed by Docker Desktop. But it is not. Because after I close the Docker desktop completely, it is still there. I even run a command to check the process of port 80 and no process is there: when no process is on this port, it is still running. It drives me crazy. I do have followed docker start tutorial to run this tutorial web application and at that time I can also open localhost:80. After that, I have stopped and removed container and even the image as well as closing the Docker app, the page, however, is still there. Does any have encountered this situation or have any idea? How does Docker do this?