Tetraquarks are exotic particles made up of four quarks, which are the fundamental building blocks of protons and neutrons. Unlike traditional baryons, which consist of three quarks, or mesons, which have two, tetraquarks combine two quarks and two antiquarks. This unique structure allows them to exist in a different state of matter. Scientists have been studying tetraquarks to better understand the strong force that binds quarks together, as described by the theory of quantum chromodynamics. Their discovery adds to the complexity of particle physics and challenges existing models of how matter is formed at the subatomic level.