Why are protons and neutrons classified as hadrons?

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Protons and neutrons are classified as hadrons because they are composed of quarks and interact through the strong force.12

In the framework of particle physics, hadrons are defined as any subatomic particles built from quarks. Within this category, protons and neutrons specifically belong to the class known as baryons. Baryons are distinguished by being composed of three quarks, which gives them a baryon number of 1. Because they are made of quarks, they are subject to the strong nuclear force, which is the defining characteristic of all hadrons.1342