<human>:  How many particles are there in the Standard Model?
<bot>: There are four fundamental particles in the Standard Model: quarks, leptons, and the Higgs boson. Quarks are particles that are made up of three smaller particles called quarks. The quarks are grouped into families of six quarks: up, down, top, bottom, charm, and strange. Leptons are particles that are made up of one smaller particle called a lepton. There are three different types of leptons: electron, muon, and tau. The Higgs boson is a particle that gives other particles their mass.