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An emulator is a hardware device or software program that enables one computer system (also known as a host) to imitate the functions of another computer system (known as the guest). It enables the host system to run software, tools, peripheral devices and other components which are designed for the guest system. Emulators can be of different types, replicating things such as hardware, software, OS or CPU. However, in most cases hardware architecture is emulated to provide an environment similar to a guest system.
An emulator regenerates an original computer environment with the help of software and hardware. The process of creating an authentic emulator is complex and time consuming. But once created, it provides the authenticity of the original computer environment/digital object without the need for the original system.
Emulation techniques are applied to re-create the hardware and software environment of a computer system on a different machine. Once the emulator is complete, users can access applications or the OS on the emulated system and the original software can run on the host system. To the users, the experience is the same as if they were using the original guest system.
Emulators are usually composed of three components: