<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 the building blocks of matter. There are six quarks in total: up, down, strange, charm, top, and bottom. Leptons are the particles that make up an electron, a neutrino, and a muon. There are three types of leptons: electrons, muons, and tau leptons. The Higgs boson is a field that permeates the universe, and gives mass to all other particles.