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.
Baryons have 1 of each of the possible quark color charges, and therefore have total color charge of 0 and can be observed in isolation.
They have spins of 1/2, 3/2, ... so they are fermions.
For each baryon there is an antibaryon made of the 3 corresponding antiquarks.
