A tetraquark is a type of subatomic particle made up of four quarks, which are fundamental constituents of matter. Unlike traditional mesons, which consist of a quark and an antiquark, or baryons, which are made of three quarks, tetraquarks combine two quarks and two antiquarks. This unique structure allows them to exhibit different properties and behaviors compared to other particles. Tetraquarks are part of the broader study of quantum chromodynamics (QCD), the theory that describes the strong force binding quarks together. Their discovery has implications for understanding the strong force and the formation of matter in the universe, contributing to the ongoing research in particle physics and the exploration of the Standard Model.