Emulation is the replicating of functionality of an obsolete system. According to van der Hoeven, “Emulation does not focus on the digital object, but on the hard- and software environment in which the object is rendered. It aims at (re)creating the environment in which the digital object was originally created.”
Examples are having the ability to replicate or imitate another operating system. Examples include emulating an Atari 2600 on a Windows system or emulating WordPerfect 1.0 on a Macintosh. Emulators may be built for applications, operating systems, or hardware platforms.
Source: Wikipedia: https://en.wikipedia.org/wiki/Digital_preservation#Emulation
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