<p>The interaction of photons with matter represents one of the most varied classes of phenomena. This includes Rayleigh scattering, Compton scattering, photoelectric absorption, pair production, nuclear Thomson scattering, nuclear resonance scattering, and Delbrück scattering. Since, in most applied fields like medical science, basic physics, agriculture, etc., it is the interaction of Gamma (<i>γ</i>) rays with matter that gives the desired output, it is of prime importance to know the various possible interactions of <i>γ</i> ray photons with matter at the atomic level. Thus, investigating photon-atom interactions offers undergraduate students an opportunity to realize and understand the phenomena mentioned above.</p>