<human>:  In the Standard Model of Quantum Chromodynamics, what is the Higgs Boson?
<bot>: The Higgs Boson is the particle that gives mass to all other particles. The Higgs Boson is responsible for the mass of all particles, including electrons, quarks, and neutrinos. The Higgs Boson is also responsible for giving other particles their mass. The Higgs Boson is the only particle that has not been directly observed.