Quarks are considered fundamental particles, meaning there is no force that "holds them together" as they are not composed of smaller constituents. The concept of a minimum distance in the universe, such as the Planck length, remains speculative and unproven, with current measurements unable to detect anything below approximately 10^20 Planck lengths. The discussion suggests that the nature of quarks and their interactions may be inherently elusive, leading to the conclusion that definitive answers about their binding forces may never be achieved. Overall, the topic highlights the complexities and limitations of our understanding of particle physics. The quest to understand quark interactions continues to challenge scientific inquiry.