Quarks are fundamental particles that are considered to be the building blocks of matter in the field of particle physics. They are extremely small, with a size of around 10^-18 meters, and are believed to be indivisible and have a fractional electric charge. Quarks combine to form composite particles called hadrons, such as protons and neutrons. There are six different types, or "flavors," of quarks: up, down, charm, strange, top, and bottom. Quarks also have a property called color charge, which is responsible for the strong force that holds them together within hadrons. Research in the field of quarks involves studying their properties, interactions, and behavior within the framework of the Standard Model of particle physics. This research helps scientists better understand the fundamental forces and particles that make up the universe.