The Standard Model is the quantum field theory describing known elementary matter and the electromagnetic, weak and strong interactions.

Matter fields occur in three generations. Each generation contains two quarks, one charged lepton and one neutrino. The first generation—up, down, electron and electron neutrino—makes ordinary stable matter; heavier generations are unstable and decay into lighter particles.

The interaction symmetries are summarized by $$SU(3)_C\times SU(2)_L\times U(1)_Y.$$ These symbols label continuous gauge-symmetry structures: $SU(3)_C$ organizes color and the strong interaction, while $SU(2)_L\times U(1)_Y$ organizes the electroweak interaction. The associated gauge fields give gluons and, after electroweak symmetry breaking, the photon and the $W^\pm,Z^0$ bosons.

The Higgs field has a nonzero vacuum value. Its interaction with the electroweak gauge fields allows the $W$ and $Z$ bosons to be massive while leaving the photon massless. Interactions between the Higgs field and fermion fields generate the measured fermion masses. The observable Higgs boson is an excitation of this field.

The Standard Model has achieved extraordinary predictive success, but it is not a theory of everything. It does not provide a quantum theory of gravity, does not explain dark matter or dark energy, and contains parameters such as particle masses and mixing angles whose values are measured rather than predicted internally.

The model is best understood as a tightly constrained framework linking particle content, symmetries and allowed interactions—not as a periodic table of unrelated particles.