Baryons always contain three quarks, and at any time may also contain some gluons and quark-antiquark pairs. A proton = uud and a neutron = udd.

Each quark in a baryon rapidly exchanges color charges with other quarks in that baryon. However, baryon (and all hadrons) have no net color charge because the different color charges cancel each other out.

They have spins of 1/2, 3/2, ... so they are fermions.

For each baryon there is an antimatter baryon (antibaryon) made of the 3 corresponding antiquarks.

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