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;First thing first, emulation accuracy shouldn't be confused with compatibility. See [[#Perfection.3F|"perfection"]] and [[#Controversy|"controversy"]] sections.
An emulator is '''accurate''' when an instruction given to both the program and the hardware results in both outputting the same result. That means accurate emulators produce much fewer audio and video glitches, usually at the cost of more processing power needed. It's often achieved by using tighter synchronization.