emulator
noun [ C ]
uk/ˈemjʊleɪtər/ usa person, group, product, etc. that copies the behaviour of another person, etc.:
The growth of iTunes and its emulators has forced changes in regulations governing the sale of music.
IT
a computer system that is designed to behave in the same way as a different system:
You will need to install a Windows emulator to run Microsoft programs on a Linux machine.