Quark fragmentation is a research area in particle physics that focuses on the process by which energetic quarks from high-energy collisions transform into a cascade of particles known as a jet. This process occurs due to the strong force that binds quarks together and results in the formation of hadrons, such as protons and neutrons. Quark fragmentation plays a crucial role in understanding the properties of quarks and the behavior of high-energy collisions in particle accelerators. Researchers study quark fragmentation to improve our understanding of the structure of matter and the fundamental forces of nature.