In recent years, Docker has earned an important place in the daily lives of developers. Let’s go take an overview of this tool and find out how Docker works behind the scenes. Features of Docker One of the most important features Docker offers is instant startup time. A Docker container can be started in a fraction of the minimum time. This is a very fast action that is incomparable with the minutes it takes to start a virtual machine. Docker uses the features of the Linux kernel for booting and interacting with containers. Due to this dependence on the Linux.