Container is an operation-system-level virtualization. The main difference between Container and Virtual Machine is the layer: the first works on the operating system, the second on the hardware layer.When we speak about container we are focused on the application virtualization and on a specific feature provided by the kernel called Linux Containers (LXC): what we do when we build containers is create new isolated Linux systems into the same host, it means that we can not change the operation system for example because our virtualization layer doesn’t allow us to run Linux containers out of Linux.

via Containers why we are here

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