What is the difference between dispersion and diffraction in waves?

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SUMMARY

Dispersion and diffraction are distinct phenomena in wave behavior. Dispersion occurs when the velocity of light in a medium varies with wavelength, leading to the separation of different wavelengths upon exiting the material. In contrast, diffraction involves the superposition of phase-related waves, resulting in intensity variations and is applicable to various wave types, including light and water waves. Both concepts can also include amplitude-dispersion, further differentiating their effects.

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Are they the same?

Is dispersion only to do with light waves & diffraction for all waves?
 
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The are different unrelated phenomena.

Dispersion occurs when the "velocity" of light in a material depends on the wavelength. Thus different wavelengts of light are spread out upon emerging from the material.

Difraction occurs when superpostion of phase related light waves cause variations in intensity.
 
Besides, these are features present in a lot of different wave types, not only light waves (water waves is a good example).
Note that not only can we have the wavelength-dispersion mentioned by Integral, but also amplitude-dispersion
 
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