Majorana neutrinos are a type of neutrino that are their own antiparticles. This means that they can annihilate themselves, unlike other neutrinos, which have distinct antiparticles. The existence of Majorana neutrinos could help explain the imbalance between matter and antimatter in the universe. These neutrinos are named after the Italian physicist Ettore Majorana, who proposed their existence in the 1930s. Detecting Majorana neutrinos is challenging, but their discovery could have significant implications for particle physics and our understanding of the fundamental forces in the universe.