There are two categories of fermions, quarks and leptons. Each of these categories classifies six types of particles. If a fermion interacts through what is labeled the color charge then it is a quark, otherwise it is a lepton.

Quarks and Color Charge

Quarks themselves appear structureless and interact through all four of the known forces. They are believed to be truly fundamental. Each has a mass and exhibits spin, and they are always found in combination with other quarks (or anti-quarks).

Each quark has an electric charge of +2/3 or -1/3. These charges determine how composite particles can be formed. The resulting charge of the composite particle is always either a -1, 0, or +1.

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