In particle physics, leptons are a class of fundamental particles that are defined by their inability to participate in the strong nuclear force, unlike hadrons. The Standard Model organizes these particles into three distinct generations, each containing charged and neutral counterparts. The charged leptons include the electron, muon, and tau, while their associated neutral partners are the respective neutrinos. These particles are essential components of matter, interacting primarily through the weak nuclear force and electromagnetism. The existence and properties of leptons provide crucial evidence for the structure and symmetries of the fundamental forces governing the subatomic realm.