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Fermions are the group of particles that make up matter. Fermions obey Pauli's exclusion principle, meaning that no two fermions can occupy the same quantum state simultaneously. This principle is responsible for the structure of atoms and the stability of matter. Fermions are classified into two categories: quarks and leptons. Quarks combine to form protons and neutrons, which are the building blocks of atomic nuclei. Leptons include electrons, muons, taus, and their corresponding neutrinos. Fermions have half-integer (1/2, 3/2, etc.) spin. Additionally, Fermions are affected by particle/antiparticle annihilations.