A virtual machine presents a specified machine interface implemented using another system. A system virtual machine supplies virtual processors, memory and devices to a guest operating system. A hypervisor mediates access to the underlying resources; execution can combine hardware assistance and software emulation.[ref]
For example, a guest can maintain its own kernel and filesystem view while a host schedules several guests on one physical machine. A Java virtual machine instead exposes a bytecode execution model to programs, illustrating a different level of abstraction. A container usually shares the host kernel rather than supplying a separate full guest kernel. The interface being virtualized determines which compatibility and isolation properties a particular virtual machine provides.

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