Double Beta Decay is a rare type of radioactive decay in which a nucleus emits two beta particles simultaneously. In this process, two neutrons in the nucleus are transformed into two protons, resulting in the emission of two electrons and two antineutrinos. This decay occurs in certain isotopes that do not undergo beta decay individually due to energy constraints. This phenomenon is significant in the study of neutrinos and has implications for understanding lepton number violation and the nature of dark matter. Researchers are investigating double beta decay to gain insights into the fundamental properties of particles and the forces that govern them.