Runtime environment
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A runtime environment is a virtual machine state which provides software services for processes or programs while a computer is running. It may pertain to the operating system itself, or the software that runs beneath it.
Example: A program written in Java, would receive services from the Java Runtime Environment by issuing commands from which the expected result is returned by the Java software. By providing these services, the Java software is considered the runtime environment of the program. Both the program and the Java software combined request services from the operating system. The operating system kernel provides services for itself and all processes and software running under its control. The Operating System may be considered as providing a runtime environment for itself.
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