When used as a virtualizer, QEMU achieves close to native performances, running guest code directly on the host CPU. When used as a machine emulator, QEMU can run systems and programs made by one machine (for example, an ARM board on a different machine. There is also a version for GNU / Linux called qemu-launcher. The program It does not have a GUI, but there is another program called QEMU manager that you can do as a graphical interface if you use QEMU from Windows. The main objective of QEMU is to emulate an operating system inside another without having to partition the hard drive, using any directory within it for its location. This virtual machine can run on any type of Microprocessor or architecture (x86, x86-64, PowerPC, MIPS, SPARC, etc.)

QEMU also has virtualization capabilities within an operating system, either GNU / Linux, Windows, or any of the operating systems supported by it. QEMU is a free and open source application licensed in part with the LGPL and the GNU GPL which the function is the emulation of processors based on dynamic translation of binaries.

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