Adding to other answers, not only containers of the docker and LXC/D types are Linux things that need a Linux kernel but often the software inside the container

Adding to other answers, not only containers of the docker and LXC/D types are Linux things that need a Linux kernel but often the software inside the container must be deployed and run on a Linux host. Often the build is done on a Linux server in a CI system and not on developers machines but developers do have to run that software too, kind of by definition.