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This lecture introduces the fundamentals of electron diffraction, covering topics such as Bragg's law, reciprocal lattice, multiple beam scattering, and dynamical scattering. It explains the origin of contrast in TEM images, the importance of electron diffraction in crystallography, and the applications of electron diffraction in material analysis. By the end of the lecture, students should understand why certain particles appear darker than others, the significance of oscillatory contrast, and the principles behind bright-field and dark-field imaging techniques.