Wikipedia: Hadron

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A hadron is a particle composed of quarks and gluons. They are divided in baryons, formed by
three quarks, like protons and neutrons,
and mesons, formed by configurations quark/antiquark, like pions, kaons.

A hadron is a subatomic particle composed of quarks and gluons. They are subdivided divided into baryons, formed by three quarks, like protons and neutrons,
and mesons, formed by configurations quark/antiquark pairs, such as pions and kaons.

A hadron is a subatomic particle composed of quarks and gluons. They are subdivided divided into baryons, formed by three quarks, like protons and neutrons, and mesons, formed by configurations quark/antiquark pairs, such as pions and kaons.