What an emulator is
An emulator is hardware or, more commonly, software that enables one computer system to behave like another. By imitating the behavior of a different system, an emulator lets programs written for that other system run on a machine they were not originally made for. In everyday use, the term usually refers to software that recreates the behavior of another device so its software can run on your computer.
Why emulators exist
Software is usually built to run on a particular kind of system, and will not run elsewhere without help. Emulators bridge that gap by making one system appear, to the software, like the system it expects. This is useful for running programs from other platforms, preserving software from older systems that no longer exist, and letting developers test software for a device without having the physical hardware in front of them.
How emulation works
An emulator imitates the behavior of the system being emulated, translating the instructions and operations that software expects into ones the host machine can perform. In effect, the emulator stands in for the original hardware, responding the way that hardware would. Because it must reproduce another system's behavior through software, emulation can be demanding, which is why emulating a complex system often requires a capable host machine.
Emulation and preservation
Emulators play an important role in preserving software and digital history. As original hardware ages, breaks down, or becomes unavailable, the programs made for it risk being lost. Emulators keep that software usable by recreating the environment it needs, long after the original machines are gone. This makes emulation a valuable tool for archiving and keeping older software accessible on modern systems.
Common uses of emulators
Emulators appear in many contexts. Developers use them to run and test software for one platform on another, such as trying out mobile apps on a desktop computer. Enthusiasts use emulators to run software from older systems. Emulation is also used to run software across different kinds of hardware. In each case, the core idea is the same: making one system behave like another so its software can run.
Why it matters
Emulators are a powerful idea that lets software escape the limits of the hardware it was built for, enabling compatibility, testing, and preservation. Understanding what an emulator is - software that makes one system imitate another - clarifies how programs can run far from their original environment. For anyone interested in software, retro computing, or development, the emulator is a key concept.
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See also: What is a virtual machine? Virtualization explained, PC game stores explained: Steam, Epic, GOG.
Sources
Published date reflects the original event date (2023-04-18). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
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