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informIT: Introduction to User Mode Linux

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“User Mode Linux (UML) is a virtual Linux machine that runs on
Linux. Technically, UML is a port of Linux to Linux. Linux has been
ported to many different processors, including the ubiquitous x86,
Sun’s SPARC, IBM and Motorola’s PowerPC, DEC’s (then Compaq’s and
HP’s) Alpha, and a variety of others. UML is a port of Linux in
exactly the same sense as these. The difference is that it is a
port to the software interface defined by Linux rather than the
hardware interface defined by the processor and the rest of the
physical computer…”

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