Native language
Sometimes referred to as the host language, the native language is the language understood by the computer. For example, binary is the language understood by the computer. In programming, native code is code that is written to run on a specific processor. In order to run the code on a different processor, an emulator must be used in order to get the computer to act like it has that processor. If an emulator is used, the code almost always runs more slowly than it would as native code.
Also see: Binary, Native compiler, Programming definitions