Final answer:
Additive mixing defines the additive color model, whereas subtractive mixing defines the subtractive color model.
Step-by-step explanation:
Additive mixing defines the additive color model, whereas subtractive mixing defines the subtractive color model. Additive mixing is used when different colored lights are being projected on top of each other, such as in theater lighting and television screens. Subtractive mixing is used in painting with pigments where colors are created by selectively absorbing parts of the spectrum.