Caption: A comparison of the spectra obtained by dispersion from a diffraction grating and a prism.
Features:
Diffraction is wavelength-dependent, and so one gets dispersion.
There is a bright central (interference) fringe (as it is called) of all wavelengths (the zeroth order undispersed "spectrum") and then to the left and right are 1st order dispersed dispersed spectra.
Higher order spectra appear farther to the left and right. The higher the order, the farther the spectra are from the bright central fringe and the dimmer they are.
As one can see from the figure, with diffraction gratings the shorter the wavelength, less spreading out (i.e., the less the diffraction).
As one can see from the figure, with refraction the shorter the wavelength, the greater the angular deviation of the light ray (i.e., the greater the refraction.