What can one determine by x-ray diffraction?

Question

What can one determine by x-ray diffraction?

Answer 1

X-ray diffraction: The scattering of X-rays by crystal atoms that produces a pattern that yields information about the structure of the crystal. The wavelengths of X-rays are comparable in size to the distances between atoms in most crystals. X-ray diffraction is the basis of X-ray crystallography.

Answer 2

X-ray diffraction is used to determine crystalline structure in solids. I don't know if it's used for anything else.