Hadron

In quantum chromodynamics, a hadron is a subatomic particle composed of quarks bound by the strong force. Hadrons are classified into two families: baryons, made of three quarks, and mesons, made of one quark and one antiquark. Protons and neutrons are the most well-known baryons, while pions and kaons are common examples of mesons. The study of hadrons has been crucial in understanding the fundamental properties of matter.