[imitation] Simulation vs Emulation vs Virtualization

Simulation
Software imitate

Application :
NS2 (Network Simulator)

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Emulation
Hardware and Software imitate

Application :
Qemu(Quick EMUlator) - Imitation the hardware and software of raspberry in any platform (Linux/Windows).
Nintedo 64(N64) - Emulator can imitate the hardware and software of N64

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Virtualization
Hardware imitate

Application :
Virtualbox - Hardware imitation can put different OS above the software of virtualbox.