Types of quantum field thories
In the standard model of particle physics and the standard model of cosmology fermions are the matter constituents of the observable universe, as opposed to bosons, which are the quanta? of force gauge fields.
The formalization of fermions is in supergeometry: fermion fields are sections of spinor bundles? with odd-degree fibers in supergeometry. This is exhibited by what is called Fermi-Dirac statistics? and the Pauli exclusion principle?.