Antiquarks are fundamental particles that are the counterparts of quarks, which are the building blocks of protons and neutrons. While quarks have a positive charge, antiquarks possess an opposite charge, making them negatively charged. Together, quarks and antiquarks combine to form mesons and baryons, which are essential components of matter in the universe. In particle physics, antiquarks play a crucial role in understanding the strong force, which binds quarks together within particles. They are part of the Standard Model, a theoretical framework that describes the fundamental forces and particles in the universe. When a quark and an antiquark meet, they can annihilate each other, producing energy in the form of photons.