The Dynamic range is another principle with the digital camera. Dynamic range is actually the measurement between the max and min values of your digital camera.
But one moment—measurement of what? In the context of photography, it is usually used to described the range between the two extreme value of white and black—so the colors, or also the range of density and luminance level.
Knowing the dynamic range of the digital camera can let you know whether the camera will be flexible in certain extreme cases—when you need very very white or very very high density.