A lepton is a type of elementary particle which is believed to not be made of anything smaller.Leptons come in six types, including the electron, muons, tauons, and three flavors of neutrinos.Leptons do not undergo the strong force, and they all share the same half-integer spin pattern.While leptons vary in weight and electric charge, neutrinos, a type of lepton, have no electrical charge and can pass through most matter.