To "run native" is to execute software written for the computer's natural, basic mode of operation; for example, a program written for Windows running under Windows. Contrast with running a program under some type of emulation or simulation (see
emulator and
simulator).
Running native has always been the fastest way to execute instructions on a computer. However, as computers become faster, the delays in emulated programs are less noticeable to the user. See
native mode.